Why does a thermocouple have at least two junctions? Since we need two materials with different Seebeck coefficients in contact to be able to measure a voltage. 0 Since we need two materials with the same Seebeck coefficients in contact to be able to measure a voltage. Since we need two materials with different temperatures in contact to be able to measure a voltage.
Answers
A thermocouple has at least two junctions because we need two materials with different Seebeck coefficients in contact to measure a voltage.
A thermocouple works on the principle of the Seebeck effect, which states that when two dissimilar metals are joined together and subjected to a temperature difference, a voltage is generated.
In a thermocouple, there are two junctions - the hot or measuring junction (exposed to the unknown temperature) and the cold or reference junction (maintained at a known temperature). The voltage difference between the two junctions is proportional to the temperature difference.
By using two materials with different Seebeck coefficients, we can accurately measure the voltage generated due to the temperature difference, and thus determine the unknown temperature.
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Related Questions
during what change is heat absorbed?
Answers
Answer: endothermic
Explanation: A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings.
help me plzzzzzzzz it helps a lot
Answers
Answer:
D
Explanation:
cracks from temperature changes is a type of physical weathering often known as freezing and thawing
3. How many grams of NaOH are produced if 20.0 g of sodium metal react with excess oxygen?
2Na(s) + 2H₂O(l) →→2NaOH(aq) + H₂(g)
Pls answer with explanation
Answers
The amount of NaOH produced when 20.0 g of Na(s) reacts with excess oxygen is 38.4 grams.
Stoichiometric problemTo find the amount of NaOH produced when 20.0 g of Na reacts, we first need to convert the mass of Na to moles using the molar mass of Na, which is 22.99 g/mol.
Number of moles of Na = 20.0 g / 22.99 g/mol = 0.870 mol
Since the balanced equation shows that 2 moles of Na react to produce 2 moles of NaOH, we can use stoichiometry to find the number of moles of NaOH produced.
Number of moles of NaOH = 0.870 mol Na x (2 mol NaOH/2 mol Na) = 0.870 mol NaOH
Now, we can convert the number of moles of NaOH to grams using the molar mass of NaOH, which is 40.00 g/mol.
Mass of NaOH produced = 0.870 mol NaOH x 40.00 g/mol = 34.8 g
Therefore, 34.8 grams of NaOH are produced when 20.0 g of Na(s) react with excess oxygen.
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If Carlos was able to drive 81m/h after 3 hours, how far would he have traveled?
Answers
Answer:
243 miles in 3 hours
Explanation:
81 mph x 3 hours
243 miles in 3 hours
what is the term for the substance formed during a chemical reaction?
Answers
The term for the substance formed during a chemical reaction is product.
Product is the name for the substance that results from a chemical reaction. A chemical reaction is a process that converts one material into another. As a result, during a chemical reaction, new compounds known as products are created.
The species that result from chemical reactions are called products. Reactants undergo a high energy transition state before becoming products in a chemical reaction. The reactants are consumed as a result of this reaction.
For example
CH₄ +2O₂⇒CO₂ +H₂O
Oxygen and methane are reactants while water and Carbon dioxide is the products.
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Proteco Oils Pressed Purity are a range of cold pressed oils ideal for cooking. The high quality oils are extracted from nuts, fruit and seeds. They are flavoursome and are naturally chemical and preservative free. Pressed Purity are one of the few oils on mainstream supermarket shelves which is 100% Australian. They offer a wider range variants than any other oil manufacturer in Australia. Proteco Oils’ state of the art refinery in Kingaroy, South East Queensland is uniquely equipped. With highly specialized equipment for complete oil processing on a large scale. Now, exporting into China and throughout Asia Pacific, this family owned company has grown with the help of Evolve Brand Design
Market Mostly females, 25-60+ years, with a contemporary cooking attitude. These consumers are health conscious, seeking natural and chemical free options for themselves and their family. The secondary target audience are men and women of all ages. This group consider themselves to be gourmet home chefs and are open to new tastes. Communication of the product concept was critical with the initial brand name development. Evolve Brand Design presented a range of concepts and the brand name ‘Pressed Purity’ was chosen. This concept was the winner as it implied the chemical free processing of the raw crops into edible oils. Likewise, the design for the brand is an analogy for pressing the oil from the fruit, nut or seeds using a vice. The Pressed Purity distinctive edge is threefold. Chemical free, 100% natural ingredients and genuinely Australian. Export opportunities have risen due to the third, very important, unique selling point (USP). In addition, they have a wide range of flavours with applications tailored to a range of food preparation methods. From flavourful salad dressing oils to baking and high heat applications like stir-frying and barbeques, Pressed Purity has a solution
Q.2.1 With the use of examples applicable to the case study, explain human resource forecasting. (10)
Q.2.2 Explain the concept of product differentiation in the context of Pressed Purity. (5)
Q.2.3 Recommend a work-study method for Proteco Oil’s refinery. (10)
Q.2.4 Identify and explain the criteria Proteco Oil used for market segmentation. (10)
Q.2.5 Identify the operational process used by Proteco Oil. Justify your choice. (10)
Answers
Q.2.1 With the use of examples applicable to the case study, explain human resource forecasting. Human resource forecasting refers to the process of estimating and planning for the future staffing needs of an organization.
Q.2.3 One work-study method that could be recommended for Proteco Oil's refinery is the method of time and motion study.
Q.2.1 It involves analyzing the current workforce, identifying future workforce requirements, and developing strategies to meet those needs. In the case of Proteco Oil's Pressed Purity, human resource forecasting would involve predicting the number and types of employees needed to support the company's growth and expansion.
For example, as Pressed Purity expands its export operations into China and throughout the Asia Pacific region, they would need to forecast the additional human resources required to manage international logistics, distribution, and marketing. This may include hiring employees with expertise in international trade, language skills, and knowledge of the target markets. Human resource forecasting would also consider the need for additional staff at the state-of-the-art refinery in Kingaroy to handle increased production and quality control.
Q.2.2 Product differentiation refers to the process of distinguishing a product from its competitors by highlighting unique features, benefits, or characteristics. In the context of Pressed Purity, product differentiation is evident in several aspects of their offerings.
One example of product differentiation is their focus on being 100% Australian. This sets them apart from other oil manufacturers in Australia who may rely on imported ingredients. By promoting their Australian origin, Pressed Purity appeals to consumers who prioritize supporting local businesses and value the quality associated with Australian products.
Additionally, Pressed Purity emphasizes being chemical and preservative-free. This addresses the growing consumer demand for natural and healthier food options. By positioning their oils as naturally chemical-free, Pressed Purity differentiates themselves from competitors who may not have such a strong emphasis on natural and chemical-free products.
Q.2.3 One work-study method that could be recommended for Proteco Oil's refinery is the method of time and motion study. Time and motion study involves analyzing and improving work processes by observing and measuring the time required to complete specific tasks or activities.
In the context of the refinery, a time and motion study could be conducted to identify any inefficiencies or bottlenecks in the oil processing operations. This could involve observing workers as they perform tasks and measuring the time taken for each step of the process. By analyzing the data collected, the refinery management can identify areas where time can be saved, processes can be streamlined, and productivity can be improved.
For example, the time and motion study may reveal that certain equipment or machinery in the refinery is causing delays or requiring excessive manual labor. Based on these findings, the management can make informed decisions on investing in more efficient equipment or implementing process improvements to optimize productivity and reduce costs.
Q.2.4 Proteco Oil used the following criteria for market segmentation:
Demographic segmentation: The primary target audience for Pressed Purity is mostly females, aged 25-60+ years, with a contemporary cooking attitude. These consumers are health-conscious and seek natural and chemical-free options for themselves and their families. The secondary target audience includes men and women of all ages who consider themselves gourmet home chefs and are open to new tastes.
Psychographic segmentation: Pressed Purity targets consumers who prioritize natural and chemical-free products. By emphasizing the use of 100% natural ingredients and being genuinely Australian, Pressed Purity appeals to health-conscious consumers who value the quality and authenticity of the products they consume. They also cater to gourmet home chefs who are looking for unique and flavorful cooking options.
Geographic segmentation: Initially, Proteco Oil focused on the domestic market in Australia.
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Which one of the following sets of units is appropriate for a third-order rate constant? s–1 mol L–1s–1 L mol–1s–1 L2 mol–2s–1 L3 mol–3s–1
Answers
The appropriate unit for a third-order rate constant is The L² mol-² s-¹. A third-order reaction is a type of chemical reaction where the concentration of each molecular responding determines how quickly the reaction proceeds.
What is rate constant ?A reaction rate constant, or reaction rate coefficient, k, quantifies the rate and direction of a chemical reaction in chemical kinetics. The rate constant, also known as the specific rate constant, is the proportionality constant in the equation expressing the relationship between the rate of a chemical reaction and the concentrations of the reactants.
What is third order reaction?A third-order reaction is a type of chemical reaction where the concentration of each molecular responding determines how quickly the reaction proceeds. Typically, the variation of three concentration factors in this reaction determines the rate.
There may be various cases involved when dealing with a third-order reaction. It might be;
(i) The concentrations of the three reactants are equal.
(ii) Two reactants are present in an equal amount, but one is present in a different amount.
(iii) The concentrations of the three reactants vary or are uneven.
Use formula,
(mol/L)¹⁻ⁿ s⁻¹
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Lithium and magnesium bromide react to produce lithium bromide and magnesium metal
Answers
Answer: \(2Li+MgBr_2\rightarrow 2LiBr+Mg\)
Explanation:
Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.
A more reactive element is one which can easily lose or gain electrons as compared to the other element.
The balanced chemical equation is:
\(2Li+MgBr_2\rightarrow 2LiBr+Mg\)
Here Lithium being more reactive than magnesium, it can easily displace magnesium from its salt solution and form lithium bromide and magneium in elemental form.
A 20 kg box of rocks is held out over a cliff at a height of 10 m. How much gravitational potential energy does the box of rocks have?
Answers
Which best describes a neutralization reaction?
a reaction between an acid and a base
a reaction between two acids
a reaction between a base and a salt
a reaction between two salts
Answers
A reaction between an acid and a base describes a neutralization reaction. Therefore, option (a) is correct.
What is a neutralization reaction?A neutralization reaction can be described as a chemical reaction in which an acid and base react with each other to produce salt and water.
The acidic strength of the reactant gives the pH of the neutralized solution. When a strong acid solution will react with a strong base the formed salt can be neither acidic nor basic, it will be neutral. For example, when HCl (a strong acid) reacts with NaOH (a strong base), the resulting salt is sodium chloride (NaCl) and water.
HCl + NaOH → NaCl + H₂O
When a strong acid solution will react with a weak base, then the formed salt will be acidic in nature. When a strong base solution will react with a weak acid then the formed salt will be basic in nature and decides the pH level of the solution.
Therefore, the reaction between the acid and base can best describe a neutralization reaction.
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Whats the density of mass?
Answers
Answer:
it depends on the mass of the object but sometimes smaller objects have more density the higher the mass the the lower the density
PLEASE HELP!! when elements chemically react, they form compounds by..
A. combining all of their electrons together
B. reaching the octet rule with their valence electrons
C. merging their protons & neutrons together
Answers
If you are given a piece of rock sugar about 2.5 cm in diameter, describe three steps you can take to dissolve it in a beaker of water in the shortest time.
Answers
Answer:
1. Crush the sugar into powder.
2. Heat the water.
3. Dissolve it by stirring continuously
Explanation:
1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving
2. Heating the water increases the capacity of water to dissolve sugar.
3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.
What volume of a 3.00M KI stock solution would you use to make 0.300 L of a 1.25M KI solution?
Answers
0.125L
Explanations:According to the dilution formula
\(C_1V_1=C_2V_2\)where:
• C1 and C2 are the ,concentrations
,• V1 and V2 are the, volumes
Given the following parameters
\(\begin{gathered} C_1=3.00M \\ C_2=1.25M \\ V_2=0.300L \end{gathered}\)Requuired
Iniital volume V1
Substitute
\(\begin{gathered} V_1=\frac{C_2V_2}{C_1} \\ V_1=\frac{1.25\times0.3}{3.0} \\ V_1=0.125L \end{gathered}\)Therefore the amount of volume required is 0.125L
What is the coefficient for water molecules in the balanced version of the following redox reaction? cr2o2−7 c2h4o→c2h4o2 cr3
Answers
The given redox reaction is:
Cr2O7^2- + C2H4O → C2H4O2 + Cr3+
To balance this reaction, we first balance the oxygen atoms by adding H2O on the right side of the equation. The number of H2O molecules added depends on the number of oxygen atoms needed. In this case, we need three O atoms on the right side, so we add three H2O molecules to the right side of the equation:
Cr2O7^2- + C2H4O → C2H4O2 + Cr3+ + 3H2O
Next, we balance the hydrogen atoms by adding H+ ions on the left side of the equation. The number of H+ ions added depends on the number of hydrogen atoms needed. In this case, we need eight H atoms on the left side, so we add eight H+ ions to the left side of the equation:
Cr2O7^2- + C2H4O + 8H+ → C2H4O2 + Cr3+ + 3H2O
Finally, we balance the charge by adding electrons. The number of electrons added depends on the difference in charge on the left and right side of the equation. In this case, the left side has a charge of -2 (from the Cr2O7^2- ion), while the right side has a charge of +3 (from the Cr3+ ion). This means that we need to add 5 electrons to the left side of the equation to balance the charge:
Cr2O7^2- + C2H4O + 8H+ + 5e- → C2H4O2 + Cr3+ + 3H2O
Therefore, the coefficient for water molecules in the balanced version of the given redox reaction is 3.
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What are some of the properties of snow
Answers
Explanation:
density, albedo, light e-folding depth, specific surface area (SSA), crystal size and shape, thermal conductivity, permeability, diffusivity,
a small negatively charged particle formed when an atom gains one or more electrons is called a(an) _____
Answers
Answer: Anion
Explanation:
A solution is made by mixing 15 mL of 1.0 M A- (conjugate base) with 7.5 mL of 1.0 M HA (weak acid). The pKa of the weak acid is 6.82, what is the final pH of the solution?
Answers
The final pH of the solution is made by mixing 15 mL of 1.0 M \(A^-\) (conjugate base) with 7.5 mL of 1.0 M HA (weak acid) is approximately 7.12
To find the final pH of the solution made by mixing 15 mL of 1.0 M \(A^-\) (conjugate base) with 7.5 mL of 1.0 M HA (weak acid) with a pKa of 6.82, follow these steps:
1. Calculate the moles of \(A^-\) and HA:
- Moles of A- = volume x concentration = 15 mL x 1.0 M = 15 mmol
- Moles of HA = volume x concentration = 7.5 mL x 1.0 M = 7.5 mmol
2. Determine the total volume of the solution:
Total volume = 15 mL + 7.5 mL = 22.5 mL
3. Calculate the concentrations of A- and HA in the final solution:
- [A-] = moles of A- / total volume = 15 mmol / 22.5 mL = 0.667 M
- [HA] = moles of HA / total volume = 7.5 mmol / 22.5 mL = 0.333 M
4. Use the Henderson-Hasselbalch equation to calculate the pH:
pH = pKa + log ([\(A^-\)] / [HA])
pH = 6.82 + log (0.667 / 0.333)
pH = 6.82 + log (2)
pH ≈ 6.82 + 0.301
pH ≈ 7.12
The final pH of the solution is approximately 7.12
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Identify the shape below:
PLEASE HELP
Answers
Answer:
linear angleee
Explanation:
lol i dont know what to put here
Answer:
B) Bent
There are a lot of types of bents but this one is linear bent.
uestion 3 (1 point)
1. Calculate the density of a liquid that has mass of 14.0g and volume of 18.0 cm? Will this liquid float on
top of water or will it sink? (Density of water is 1.0 g/mL)
I
Answers
formula for density of liquid = mass ÷ vol
= 14.0 g ÷ 18.0 cm³
= 0.77778 g/cm³ ( 5sf)
= 0.778 g/cm³ ( 3sf )
18.0 cm³ is the same as 18.0 ml
Therefore, the liquid will float on water as the water is denser than the liquid.
18.0 cm³ is equivalent to 18.0 ml, in light of the fact that water is denser than liquid, the liquid will float on it.
What is the density of a liquid?Density is defined as d = M/V, where M stands for mass and V for volume. The unit of density that is most frequently used is grams per cubic centimeter.
The formula for liquid density is mass divided by volume.
= 14.0 g ÷ 18.0 cm³
= 0.77778 g/cm³
= 0.778 g/cm³
The same procedure used to determine a solid's density is used to determine a liquid's density. Calculate the fluid's mass, then its volume, then divide mass by volume.
To determine the fluid's mass, weigh the fluid in the container, pour it out, weigh the empty container, and then subtract the empty container's mass from the mass of the filled container.
Therefore, in light of the fact that water is denser than liquid, the liquid will float on it.
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how is oxygen transported in the blood?multiple choice10-20% dissolved in plasma; 80-90% as oxyhemoglobin98-99% dissolved in plasma; 1-2% as oxyhemoglobin50% dissolved in plasma; 50% as oxyhemoglobin1-2% dissolved in plasma; 98-99% as oxyhemoglobin
Answers
The correct answer is A. 10-20% of oxygen is dissolved in plasma and 80-90% is transported as oxyhemoglobin in the blood.
Oxygen is transported in the blood primarily through a combination of dissolved oxygen in plasma and oxygen bound to hemoglobin within red blood cells. Approximately 10-20% of oxygen is found dissolved in plasma, while the remaining 80-90% is bound to hemoglobin in the form of oxyhemoglobin. The concentration of oxygen in plasma is determined by the partial pressure of oxygen in the environment, while the amount bound to hemoglobin is determined by the amount of hemoglobin present in the blood. Oxygen can also be transported in the form of bicarbonate and other small molecules.
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complete question: how is oxygen transported in the blood?multiple choice
A.10-20% dissolved in plasma; 80-90% as oxyhemoglobin
B.98-99% dissolved in plasma; 1-2% as oxyhemoglobin
C.50% dissolved in plasma; 50% as oxyhemoglobin
D. 1-2% dissolved in plasma; 98-99% as oxyhemoglobin
Acetic acid, also known as ethanoic acid, has the chemical formula of CH3COOH. Determine the most mass of the acid.
(a) 60.05g
(b) 24.02g
(c) 40.00g
(d) 52.04g
Answers
Acetic acid is composed of CH3COOH. Mass= 6.022× (10 )23 / 60.06 =9.973× (10 )−23 g.
What is the elements of CH3COOH?Acetic acid, also termed ethanoic acid and methane carboxylic acid, is a colorless liquid with a strong, recognizable, pungent, and sour smell. Acetic acid is composed of CH3COOH.
Four hydrogen (H) atoms, two oxygen (O) atoms, and two carbon (C) atoms make up its atomic composition.
It is an organic compound since carbon appears in its chemical composition.
As of writing, 60.06 g/mol is the molar mass of CH 3 COOH.
Finding the mass of one CH 3 COOH molecule is necessary.
This equation can be used:
The quantity of atom = Molar mass / mass Equals * Avogadro number
In the formula, we can change the values shown below:
Atom count is one.
Molar mass = 60.06 g/mol
Avogadro number = 6.022 * (10) 23
The quantity of atoms Molar mass / mass * Avogadro number
∴1= 60.06 / mass ×6.022 × (10 )23
Mass= 6.022× (10 )23 / 60.06 =9.973× (10 )−23 g.
The Complete Question.
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H IT H-C --H + Ħ Н The model above shows the structural formula for ethane. What is the chemical formula for ethane? OA. C2H6 OB. 2CH3 Oc. 8CH OD. C6H2
Answers
Answer:
B
Explanation:
How many L in 1.98m solution using 4.2mol
Answers
The volume needed to make 1.98 M of the solution is 2.12L
Molarity of a given solution is defined as the total number of moles of solute per litre of solution. One molar is the molarity of a solution where one gram of solute is dissolved in a litre of solution. As we know, in a solution, the solvent and solute blend to form a solution, hence, the total volume of the solution is taken.
Given,
Molarity = 1.98m
Moles = 4.2 mol
Molarity = number of moles of solute / volume of solution in L
Volume = moles / molarity
= 4.2 / 1.98
= 2.12 L
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I need urgent help with these balancing equation lessons. I don’t understand how to balance the chemical equations so could somebody pls explain fully. Thanks. Sorry for bad photo.
Answers
For example we have KNO3___KNO2+O2 so you have to balance them first of all see how many K are there there is only 1 in the reactant so then see how many OxygenIn first recatant is 2 and in second one is also 2 so add them it’s 4 now we have KNO3_____KNO2+O4 now we have 4 oxygen we need to make KNO4 so add 1 it will be Balanced! That’s all I hope you understood
Select the correct answer. which substance in this redox reaction is the oxidizing agent? cu 2agno3 → 2ag cu(no3)2 a. n b. agno3 c. cu d. no3− e. cu(no3)2
Answers
AgNO₃ will act as the oxidising agent.
For the given chemical equation:Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂
Half reactions for the given chemical reaction:
Reducing agent:
Cu → Cu²⁺ + 2e⁻
Copper is a reducing agent because it is losing 2 electrons, which causes an oxidation process.
Oxidising Agent:
Ag⁺ + e⁻ → Ag
The silver ion undergoes a reduction process and is regarded as an oxidizing agent since it is acquiring one electron per atom.
Hence, AgNO₃ is considered as an oxidizing agent and therefore the correct answer is Option B.
Oxidising and Reducing agentsAn oxidizing agent is a substance that reduces itself after oxidizing another material. It passes through a reduction process in which it obtains electrons and the substance's oxidation state is decreased.A reducing agent is a chemical that oxidizes after reducing another material. It passes through an oxidation process in which it loses electrons and the substance's oxidation state increases.To know more about the process of Oxidation and Reduction, refer to:
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How many calories are there in 32 Calories
Answers
Answer:
32
Explanation:
A coach takes a group of people to northern Italy. They are going on a travel week!
The one-way distance is 1360 km, to Verona.
The coach consumes 22 litres of diesel per 100 km.
The density of diesel is 0,84.10 3 kg.m -3
The formula of diesel is C 16 H 30 .
In addition to carbon dioxide, the combustion of diesel also produces a little carbon. The
ratio between the two substances in the reaction equation is: C : CO 2 = 1 : 7
the question is: Draw up the reaction equation for the combustion of diesel. Pay attention to the given ratio.
Answers
The balanced chemical equation for the combustion of diesel is 2 C₁₆H₃O+15 O₂\(\rightarrow\)32 CO₂ +3 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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show all work.
5. How many grams of Na₂CO3 are needed to make a 50.0 mL of 1.7 M sodium carbonate (Na₂CO3) solution?
Answers
To make a 50.0 mL solution of 1.7 M sodium carbonate (Na₂CO3), we need to determine the mass of Na₂CO3 required.
To calculate the mass of Na₂CO3 needed, we can use the formula:
Mass = Concentration x Volume x Molar Mass
First, we convert the given volume from milliliters to liters:
Volume = 50.0 mL = 50.0/1000 L = 0.05 L
Next, we substitute the given concentration and volume values into the formula:
Mass = 1.7 M x 0.05 L x Molar Mass of Na₂CO3
The molar mass of Na₂CO3 can be calculated by adding the atomic masses of sodium (Na), carbon (C), and three oxygen (O) atoms:
Molar Mass of Na₂CO3 = (2 x Atomic Mass of Na) + Atomic Mass of C + (3 x Atomic Mass of O)
After obtaining the molar mass value, we can substitute it into the formula and perform the calculation to determine the mass of Na₂CO3 required to make the 50.0 mL solution of 1.7 M sodium carbonate.
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why is it usually not possible to recrystallize a liquid substance?