2. Calculate the number of moles represented by the following masses.
A. 2.00 × 102 g of silver
B. 37.1 g of silicon dioxide, SiO2
50 POINTS!!!!!!!!!!!!
Answers
Answer:
That's the answer and I hope it helps.
Related Questions
Which is a type of lipid?
A. Disaccharide
B. Triglyceride
C. Nucleotide
D. Enzyme
SUBMI
Answers
Answer:
B. triglyceride
Explanation:
Answer:
triglyceride becauseit is a fatty acid
describe the theory of plate tectonics
Answers
Answer:
The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
Explanation:
From Google
It is estimated that the total amount of oxygen (O₂) contained in BIFs is equivalent to 6.6% of the oxygen present in the modern atmosphere. This is quite impressive given that the atmosphere during Archaean and early Proterozoic times was largely devoid of oxygen! Therefore, this reflects the photosynthetic efficiency of the early biosphere, coupled with its operation over long periods of time. Knowing that the mass of the modern atmosphere is 5.01×10¹⁸ kg, of which 21% is oxygen, what is the mass (in kilograms) of oxygen contained within BIFs?
_____ ×10¹⁶ kg of O₂ contained in BIF deposits
Knowing that the molecular mass of O₂ is 32 g/ mole (0.032 kg/ mole ), how many moles of O₂ are contained within BIFs?
____ ×10¹⁸ moles of O₂ contained in BIF deposits
Now, let us think about iron (Fe). The total mass of BIF's globally is estimated at 5.0×10¹⁷ kg, wherein iron accounts for approximately 35% by mass. The atomic mass of iron is 55.8 g/mole(0.0558 kg/mole). What is the total mass of iron in BIFs in kilograms and moles?
_____ ×10¹⁷ kg of Fe contained in BIF deposits
_____ ×10¹⁸ moles of Fe contained in BIF deposits
Finally, take the values you have computed in units of moles, and express them as the molar ratio of iron (Fe) to oxygen (O₂) of BIFs. You can do this by dividing both sides of the ratio by the larger number (Fe in this case).
FeO₂=1 _____
Your calculated ratio above should fall between the Fe: O₂ molar ratios of both Hematite (1:0.75) and Magnetite (1:0.67). Which molar ratio is your calculated value closest to (meaning which iron component, Hematite or Magnetite, is the more dominate in BIFs)?
Answers
The calculated molar ratio of iron to oxygen in BIFs is 1.452.
Comparing this ratio to the molar ratios of Hematite (1:0.75) and Magnetite (1:0.67), we can see that the calculated value of 1.452 is closest to the Hematite molar ratio of 1:0.75. Therefore, Hematite is the more dominant iron component in BIFs.
To calculate the mass of oxygen contained within BIFs, we'll use the given information:
Total mass of the modern atmosphere = 5.01×10¹⁸ kg
Percentage of oxygen in the modern atmosphere = 21%
Mass of oxygen contained within the modern atmosphere = (5.01×10¹⁸ kg) × (0.21) = 1.051×10¹⁸ kg
Percentage of oxygen contained in BIFs = 6.6% (given)
Mass of oxygen contained within BIFs = (6.6% of 1.051×10¹⁸ kg) = 6.6/100 × 1.051×10¹⁸ kg = 6.9166×10¹⁶ kg
Therefore, the mass of oxygen contained within BIFs is 6.9166 × 10¹⁶ kg.
To calculate the number of moles of oxygen contained within BIFs, we'll use the molecular mass of O₂:
Molecular mass of O₂ = 0.032 kg/mole
Number of moles of oxygen contained within BIFs = (Mass of oxygen in BIFs) / (Molecular mass of O₂)
= (6.9166×10¹⁶ kg) / (0.032 kg/mole) = 2.1614375 × 10¹⁸ moles
Therefore, the number of moles of oxygen contained within BIFs is 2.1614375 × 10¹⁸ moles.
Next, let's calculate the mass of iron in BIFs:
Total mass of BIFs = 5.0×10¹⁷ kg
Percentage of iron in BIFs = 35%
Mass of iron contained within BIFs = (35% of 5.0×10¹⁷ kg) = 35/100 × 5.0×10¹⁷ kg = 1.75×10¹⁷ kg
To calculate the number of moles of iron contained within BIFs, we'll use the atomic mass of iron:
Atomic mass of iron = 0.0558 kg/mole
Number of moles of iron contained within BIFs = (Mass of iron in BIFs) / (Atomic mass of iron)
= (1.75×10¹⁷ kg) / (0.0558 kg/mole) = 3.1367419 × 10¹⁸ moles
Therefore, the number of moles of iron contained within BIFs is 3.1367419 × 10¹⁸ moles.
Finally, let's calculate the molar ratio of iron to oxygen in BIFs:
Molar ratio of iron to oxygen = (Number of moles of iron) / (Number of moles of oxygen)
= (3.1367419 × 10¹⁸ moles) / (2.1614375 × 10¹⁸ moles)
≈ 1.452
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Calculate a missing equilibrium concentration Question For the following equilibrium: 2A+B=C+ 2D = 0.80 M, and D = 0.25 M, and Kc = 0.22, what is the If equilibrium concentrations are B] = 0.44 M, C equilibrium concentration of A? . Your answer should include two significant figures (round your answer to two decimal places). Provide your answer below:
Answers
The equilibrium concentration of A if equilibrium concentrations are B = 0.44 M and the following equilibrium: 2A + B = C + 2D = 0.80 M, and D = 0.25 M, and Kc = 0.22 is 0.46 M.
To calculate the missing equilibrium concentration of A, we will use the equilibrium constant expression for the given reaction: 2A + B ⇌ C + 2D. The Kc expression is:
Kc = [C][D]² / ([A]²[B])
Given the equilibrium concentrations and Kc value, we have:
0.22 = [C][0.25]² / ([A]²[0.44])
First, we need to solve for [C]:
[C] = 0.22 × ([A]²[0.44]) / [0.25]²
Now, let's plug in the values we have for the equilibrium concentrations of B and D:
0.22 = [C]×(0.25)² / ([A]²×0.44)
Solving for [A]², we get:
[A]² = ((0.25)² × 0.22) / (0.44 × [C])
We know that the stoichiometry of the reaction is 2A + B ⇌ C + 2D, so we can write an expression for [C] based on the given concentrations:
[C] = 0.44 - [A]
Now, substitute this expression for [C] into the equation for [A]²:
[A]² = ((0.25)² × 0.22) / (0.44 × (0.44 - [A]))
Solve for [A] using a numerical method, such as the quadratic formula, and round your answer to two decimal places:
[A] ≈ 0.46 M
The equilibrium concentration of A is approximately 0.46 M.
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How does modern periodic table explain the cause of periodicity.
Answers
Answer:
The cause of periodicity in properties is the repetition of similar outer electronic configuration after certain regular intervals. For example, all the elements of group 1 i.e. alkali metals have a similar outer electronic configuration, ns1.
Which interaction occurs when light goes into an object as heat energy?
A. Absorbed light
B. Bright light
C. Reflected light
D. Refracted light
Answers
Interaction occurs when light goes into an object as heat energy is Absorbed light.
Absorbed light makes an object dark. Absorption of light is when the light is absorbed by the object and converts it into heat energy. The objects converts the wavelength of light into the larger wavelength of heat. this makes the object warmer and produced energy. Absorption depends on the frequency of light that is transmitted. The wavelength of light defined as the distance between the the two successive troughs of the the light wave.
Therefore, Interaction occurs when light goes into an object as heat energy is Absorbed light.
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How do ocean currents affect the air temperature of Buenos Aires and Cape Town? this is for science
Answers
I also have the same question
Which aspect of an NMR spectrum tells you the number of neighboring protons to those that are giving the signal
Answers
In an NMR spectrum, the splitting pattern aspect tells you the number of neighboring protons to those that are giving the signal.
Nuclear magnetic resonance (NMR) spectroscopy is a research method for studying organic molecules. NMR spectroscopy, like mass spectroscopy, aids in the identification of unknown substances. NMR spectroscopy is used to determine the structure of a molecule by using its magnetic and chemical characteristics.
NMR spectroscopy is used to observe the interactions of atomic nuclei with their surroundings, and it is often used to determine the molecular structure of organic compounds. In particular, the NMR spectrum can tell us about the types and relative amounts of nuclei in a molecule, as well as their local environment.
NMR spectroscopy is used to identify the arrangement of atoms in a molecule and to elucidate the identity of molecules. Splitting patterns in an NMR spectrum are used to determine the number of neighboring protons to those that are producing the signal. The splitting pattern tells us the number of identical nuclei that are adjacent to the observed nucleus.
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which mineral would most likely be found in a necklace? graphite, halite, sulfur, or emerald?
Answers
Answer:
D is the answer because I think it is right plus I know they don't use two off them
Answer:Emerald is a gemstone that might be found in a necklace.
Explanation:Trust me i just got it right and i get all my other questions right.
According to Dalton's Law of Partial Pressures, the pressure of oxygen in dry air would be
Answers
The pressure of the oxygen in the air is 0.21 atm. The partial pressure of a gas is the contribution that gas makes to the total pressure when the gas is part of a mixture.
_N2+_F2→ _NF3
What goes inside the blanks
Answers
Second blank: 3
Third blank: 2
Have a good dayyy, hope this helpssss!!!
Help would be greatly appreciated
Which choice identifies the correct limiting reactant and correct reasoning?
N2 + 3H2 → 2NH3
10.1 g N2 produces 0.72 moles NH3.
1.2 g H2 produces 0.39 moles NH3.
A. H2 because it has the lower yield
B. N2 because it has the higher starting mass
C. H2 because it has the lower starting mass
D. N2 because it has the higher yield
Answers
The limiting reactant is H₂ because it has a lower yield. The correct option is A.
What are limiting reactants?Limiting reactants in a reaction are the reactants that are used up in a given reaction in the presence of excess reactants.
Limiting reactants determine the amount of a product that can be formed in a reaction.
Limiting reactants result in the formation of the smallest amount of a product in a reaction.
Considering the given equation of reaction:
N₂ + 3 H₂ → 2 NH₃
The mole ratio of the reactants in the reaction is 1 : 3 for nitrogen and hydrogen.
10.1 g N₂ produces 0.72 moles NH₃.
1.2 g H₂ produces 0.39 moles NH₃.
The least amount of product that is formed is from hydrogen. Hence, hydrogen is the limiting reactant.
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Identify the key differences between the Articles of Confederation and the U.S. Constitution. Then explain which document created the better system of government for the new nation, and support your response with the differences you have identified.
22 POINTS + WILL RATE BRAINLEST!!!!!
Answers
The key differences between the Articles of Confederation and the U.S Constitution is the article of confederation is sovereignty in states and the constitution is expand the governments authority.
The document created the better system of government for the new nation is the US constitution.
The Article of confederation , the state have stronger power than the central power and in the US constitution , the power of central government is stronger than the states. The important development was the establishment of three departments. There are three departments of government that is legislative , executive and judicial.
Thus, The key differences between the Articles of Confederation and the U.S. Constitution is the article of confederation is sovereignty in states and the constitution is expand the governments authority.
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Which of the following mathematical expressions should a student use to calculate the volume of 9.85 moles of helium gas in a balloon?
Answers
To calculate the volume of a gas, use the ideal gas law equation, PV = nRT.
Where:
P = pressure of the gas (in units of pressure, such as atm)
V = volume of the gas (in units of volume, such as liters)
n = number of moles of the gas
R = ideal gas constant (0.0821 L·atm/(mol·K) or 8.314 J/(mol·K))
T = temperature of the gas (in units of temperature, such as Kelvin)
It is important to note that the expression to calculate the volume of the gas would depend on the specific conditions (pressure and temperature) under which the balloon is being measured.
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Compared with halogens, the alkali metals in the same period has
electronegativity
the same
O larger
O smaller
Answers
QUICK!!!! please
Which of the following dilutions would produce 2.0M acid from 3.0M acid
A) 3.0mL acid and 2.0mL water
B) 2.0mL acid and 1.0mL water
C) 2.0mL acid and 3.0mL water
D) 1.0mL acid and 2.0mL water
Answers
Answer:
that's a difficult question
Explanation:
Sorry!!!!!
Contractile vacuoles are organelles that maintain water balance by pumping excess water out of some single-celled pond organisms. In humans, the kidney is an organ chiefly involved in maintaining water balance. These facts best illustrate that.
Answers
These facts serve as the best examples of how the tissues, organs, and organ systems in all living things collaborate to maintain homeostasis because contractile vacuoles are organelles that regulate water balance
Homeostasis is the term used to describe the body's need to achieve and preserve a specific state of equilibrium. A physiologist by the name of Walter Cannon first used the term in 1926. The tendency of the body to keep internal conditions, like blood sugar and temperature, at essentially constant and stable levels is known as homeostasis.
Between cells and an entire organ, there is a biological organisational level called tissue. An assembly of comparable cells and their extracellular matrix from the same origin that work together to perform a particular function is referred to as a tissue.
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I need this done. Today. Now. Within the next hour. Im dead. HELP ME.
Using both of the articles, answer the questions below. You can answer questions on a word processing document and upload it for grading, or you can submit answers to questions directly. Be sure to review the grading rubric before you begin.
Summarize the scientific information that leads to conservation in each of the articles.
What social issues affected the problem or its solution in each of the stories?
How did economics delay scientists' first attempts for conservation in each story?
Describe the political actions that led to successful conservation in both stories.
First article is about the forest and how cutting down trees is bad. The second one is about mountain gorillas going extinct. (Also this is science but like thats not an option so I put chemistry) WHOEVER HELPS ME, THANK YOU
Answers
Which of the following equations shows a physical change? (1 point)
O CaCOg →) CaO + CO,
O N₂O5NO₂ + O₂
O H₂O(s)→ H₂O(l)
O C12H22O11 + 1202 12CO₂ + 11H₂O
(I need this now lol)
Answers
Atoms of hydrogen are then balanced. Watch the following video to learn more about oxygen atoms. C12H22O11 with 12O2 equals 12CO2 plus 11H2O.
How to find Balance equations ?Balance C12H22O11 + O2 CO2 + H2O
Word formula: Sucrose + Oxygen + Carbon + WaterIt is a combustion reaction, which is the type of chemical reaction involved.Strategies for Keeping Things Balanced: In these reactions, oxygen is being added along with sucrose, which is often known as table sugar. We were burning sugar, in other terms. As a result, this is an instance of combustion.First, adjust the coefficient in front of the CO2 molecule to balance the carbons. You may now begin balancing this equation using that information.As the coefficient for CO2, you should use 12.Atoms of hydrogen are then balanced. Watch the following video to learn more about oxygen atoms.C12H22O11 with 12O2 equals 12CO2 plus 11H2O.To Learn more About Atoms of hydrogen refer to:
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A cat runs across a road that
is 9 meters (m) wide. It
covered this distance in 3
seconds (s). What is the
speed of the cat?
Answers
No links please and please help
Answers
Helppp me pretty please
Answers
Answer:
I think the correct answer would be the second one
which of the following is a water contaminant that can cause acid mine drainage? a methane b carbon dioxide c flux d sulfuric acid
Answers
The water contaminant that can cause acid mine drainage is sulfuric acid.
Acid mine drainage is a significant environmental issue that occurs when sulfide minerals, typically found in mines or mining waste, come into contact with water and air. The sulfide minerals react with oxygen and water to form sulfuric acid.
This acidic solution then leaches out other minerals and metals from the surrounding rocks, resulting in highly acidic and metal-rich water. While methane, carbon dioxide, and flux (a material used in metal smelting) may be present in mining environments, they are not directly responsible for causing acid mine drainage.
Methane is a flammable gas, carbon dioxide is a greenhouse gas, and flux is a material used to facilitate metal melting.
Therefore, they do not directly contribute to the formation of acidic mine drainage. Sulfuric acid is the primary contaminant responsible for the acidification of water in mining areas.
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1. What are the 3 prevailing winds?
Answers
A topsoil has the following properties: Clay content: 30% Soil OM: 2%
CEC meq/100g: 15 pH: 4.8
A soil test lab recommended 4 tons/a of a 75% lime material. Estimate the final pH of the soil if all of this material were applied
Answers
The estimated final pH of the soil, if all 4 tons/a of the 75% lime material are applied, would be approximately 11.91. pH is a measure of the acidity or alkalinity of a solution. It is a logarithmic scale that ranges from 0 to 14, where a pH of 7 is considered neutral.
To estimate the final pH of the soil after applying the lime material, we need to consider the properties of the soil and the characteristics of the lime material. The lime material is 75% pure lime, which means it contains 75% calcium carbonate (CaCO3).
First, we calculate the lime requirement in pounds per acre (lbs/a):
Lime requirement (lbs/a) = Recommended lime rate (tons/a) * 2000
Given that the recommended lime rate is 4 tons/a, the lime requirement is:
Lime requirement (lbs/a) = 4 * 2000 = 8000 lbs/a
Next, we calculate the Effective Calcium Carbonate Equivalent (ECCE) for the lime material:
ECCE = % purity * CCE
CCE (Calcium Carbonate Equivalent) is a measure of the neutralizing ability of the lime material. Since the lime material is 75% pure lime, the ECCE is:
ECCE = 0.75 * 100 = 75%
Now, we calculate the lime index (LI):
LI = Lime requirement (lbs/a) / ECCE
LI = 8000 / 75 = 106.67 lbs/a
The lime index represents the amount of lime required to raise the pH of the soil by one unit. In this case, it is 106.67 lbs/a.
To estimate the final pH, we use the following equation:
Final pH = Initial pH + (LI / CEC)
Given that the initial pH of the soil is 4.8 and the CEC is 15 meq/100g, we can calculate the final pH:
Final pH = 4.8 + (106.67 / 15) = 4.8 + 7.11 = 11.91
The estimated final pH of the soil, if all 4 tons/a of the 75% lime material are applied, would be approximately 11.91.
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which of your body structures was the effector in the reaction time test? what was your motor response?
Answers
Skeletal muscle was the Effector in the reaction time test and motor response reflects the muscular component of reaction time.
The Effector in the reaction time test was the skeletal muscle in the finger which is used to press the button. muscle and glands produces a specific response to a stimuli's and the motor response was reaction time test is the time between electromyographic activity and movement and the motor response is the response which reflects the skeletal muscle component of reaction time.
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draw one possible dipeptide that is formed between alanine and leucine, as the zwitterion.
Answers
To form a dipeptide between Alanine and Leucine, we have to join the carboxyl group (COOH) of Alanine with the amino group (NH₂) of Leucine via a peptide bond. The resulting molecule will have a zwitterionic form. The zwitterionic form of the dipeptide will have both a positive and a negative charge.
A dipeptide is a molecule made up of two amino acid residues joined together via a peptide bond. A peptide bond is a bond between the amino group (NH₂) of one amino acid and the carboxyl group (COOH) of another amino acid. Amino acids are the building blocks of proteins. Alanine and Leucine are two of the twenty common amino acids found in nature.
A zwitterion is a molecule that has a positive charge on one part of the molecule and a negative charge on another part of the molecule. Zwitterions are electrically neutral overall. They are formed when a molecule that has both acidic and basic functional groups is dissolved in a solvent. The acidic and basic groups react with each other to form a neutral molecule that has both positive and negative charges. The zwitterionic form of an amino acid is the form that is found in proteins.
The chemical formula for Alanine is C₃H₇NO₂, and the chemical formula for Leucine is C₆H₁₃NO₂. To form a dipeptide between Alanine and Leucine, we have to join the carboxyl group (COOH) of Alanine with the amino group (NH₂) of Leucine via a peptide bond. The resulting molecule will have a zwitterionic form. The zwitterionic form of the dipeptide will have both a positive and a negative charge.
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8.
a) Will all of the salt dissolve?
b) What mass of NaNO3 will dissolve at this temperature?
Grams of solute
Oh oh
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
KI
b. 10g of Ce₂(SO4)3 at 10°C.
c. 125g of KNO3 at 60°C.
NH37
d. 65g of NH4Cl at 80°C.
e. 12g of NH3 at 90°C.
NaNO3
KCIO3
KNO3
NHẠC
Ce2(SO4)3
0
0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
KCI
Naci
Determine if each of the following is unsaturated (U), saturated (S), or
supersaturated (S.S).
a. 55g of NH3 at 20°C.
f. 80g of NaNO3 at 10°C..
g. 145g of NaNO3 at 80°C.
h. 35g of NaCl at 100°C..
Answers
Whether a substance dissolves in a particular solvent depends on several factors, including the solubility of the substance in the solvent, the temperature of the solvent, and the amount of substance and solvent involved.
What is solubility?Solubility refers to the ability of a substance to dissolve in a solvent, which is typically a liquid, gas, or solid.
The solubility of salts tends to increase with temperature, so it is likely that more Ce₂(SO₄)₃ will dissolve at higher temperatures and not at 10°C.At 60°C, it is likely that all 125g of KNO₃ will dissolve in the solvent.At 80°C, it is likely that all 65g of NH₄Cl will dissolve in the solvent.55g of NH3 is less than what can dissolve in 1 liter of water at this temperature. Thus, the solution is unsaturated (U).At 10°C, the solubility of NaNO₃ in water is about 80 g/100 mL. Since the amount of NaNO₃ is equal to or less than the maximum amount that can dissolve in 100 mL of water, the solution is saturated (S).At 80°C, the solubility of NaNO₃ in water is about 200 g/100 mL. Since the amount of NaNO₃ is greater than the maximum amount that can dissolve in 100 mL of water, the solution is supersaturated (S.S).At 100°C, the solubility of NaCl in water is about 40 g/100 mL. Since the amount of NaCl is less than the maximum amount that can dissolve in 100 mL of water, the solution is unsaturated (U).To find out more about solubility, visit:
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how many moles of silver nitrate are needed to produce 6.75 moles of copper (II) nitrate upon reacting with excess copper?
Answers
Answer:
13.50 moles of AgNO₃ are needed to produce 6.75 moles of Cu(NO₃)₂
Explanation:
We state the reactants:
AgNO₃
Cu
Then, the products are:
Cu(NO₃)₂
Ag
The reaction is: 2AgNO₃ + Cu → 2Ag + Cu(NO₃)₂
Ratio is 1:2.
The copper is in excess, so the limiting reactant is the silver nitrate:
1 mol of Cu(NO₃)₂ is produced by 2 moles of AgNO₃
Then, 6.75 moles of copper (II) nitrate would be produced by, the double of moles
(6 75 . 2) /1 = 13.50 moles
how many total atoms are there in 54.1 g54.1 g of carbon disulfide ( cs2cs2 )?
Answers
The average number of atoms in 54.1 g of carbon disulfide is \(6.02 x 1023.\)
To determine the number of atoms in a given mass of a substance, we need to use the Avogadro's number, which is \(6.02 x 10^23\) atoms per mole of a substance. The first step is to calculate the number of moles of carbon disulfide in 54.1 g using the molar mass of the compound, which is \(12.01 g/mol\) for carbon and \(32.07 g/mol\) for sulfur. Thus, the molar mass of carbon disulfide is:
\(12.01 g/mol (for carbon) + 32.07 g/mol (for sulfur) x 2 = 76.15 g/mol\)
Dividing the mass by the molar mass, we get:
\(54.1 g / 76.15 g/mol ≈ 0.71 mol\)
Finally, we can calculate the number of atoms by multiplying the number of moles by Avogadro's number:
\(0.71 mol x 6.02 x 10^23\) atoms/mol = approximately \(4.28 x 10^23\) atoms
Therefore, there are approximately \(6.02 x 10^23\) atoms in 54.1 g of carbon disulfide.
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