How many grams of CH3OH must be added to water to prepare 275 mL of a solution that is 3.5 M CH3OH?

The substance is lithium (Li).

Isotopes are atoms of the same element with variable numbers of neutrons but the same number of protons in their nucleus.

Hence, although having different atomic masses, they have the same atomic number.

The physical characteristics of an element's isotopes can differ from their chemical characteristics because of their varied atomic masses.

Isotopes include, for instance:

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Answer:

APT is made of a nitrogen base (adenine), a ribose sugar, and three phosphate groups.

Hope this helped! :)

Answer:

The energy released from each molecule of glucose is used to attach a phosphate to each of four molecules of adenosine diphosphate (ADP) to produce two molecules of adenosine triphosphate (ATP) and an additional molecule of NADH.

Explanation:

Answer:

\( \huge{4.969 \times {10}^{ - 19} \:J }\)

Explanation:

The energy of the purple lamp can be found by using the formula

E = hf

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question.

\( f = 7.5 \times 10^14 \: Hz \)

We have.

\( E = 6.626 \times 10^{-34} \times 7.5 \times 10^{14} \)

We have the final answer as

\(4.969 \times {10}^{ - 19} \: J\)

Answer:

4560.8km

Explanation:

2,850.5×1.6 = 4560.8km

The relative volumes of chloroform and water that should be used is 9:10

Concentration of solution in chloroform = \(90\) ( moles of chloroform )

Concentration of solution in water = \(10\) ( moles of water )

Dissociation constant at \(25^oC\); \(K_D = 10\)

\(K_D =\) Concentration of solution in chloroform / Concentration of solution in water

Meaning;

\(K_D = \frac{\frac{mole\ of\ chloroform}{volume\ of\ chloroform} }{\frac{mole\ of\ water}{volume\ of\ water} }\)

Since \(90\) mole is present in chloroform and \(10\) mole is present in water, Total mole of Caffeine present is \(100\)

Now, we substitute our given values into the equation

\(10 = \frac{\frac{90}{volume\ of\ chloroform} }{\frac{10}{volume\ of\ water} }\\\\10 *\frac{10}{volume\ of\ water} = \frac{90}{volume\ of\ chloroform} \\\\\frac{100}{volume\ of\ water} = \frac{90}{volume\ of\ chloroform}\\\\\frac{volume\ of\ chloroform}{volume\ of\ water} = \frac{90}{100}\\\\ \frac{volume\ of\ chloroform}{volume\ of\ water} = \frac{9}{10}\\\\ \frac{volume\ of\ chloroform}{volume\ of\ water} = 9:10\)

Therefore, the relative volumes of chloroform and water that should be used is 9:10

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The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer is

A methhanoic Acid

A group of similar or different atoms linked together makes the molecules. The molecule given is methanoic acid. Thus, option A is correct.

Methanoic acid is a compound that has carboxylic acid as the functional group. It is the simplest carboxylic acid that has the formula HCOOH. As the molecule has a COOH group it will be acid.

The molecule can not be an aldehyde as it lacks the R−CH=O group, it cannot be alcohol as it lacks the OH group, and neither it can be methylamine as it lacks the nitrogen group.

Therefore, option A. methanoic acid is correct.

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Answer:

The principal quantum number (n) describes the size of the orbital. Orbitals for which n = 2 are larger than those for which n = 1, for example.

Answer:

1. CH₂Br > CH₂OH > CH₂NH₂ > CH₃

2. -F > -CHO > - CH₂OH > CH₃

Explanation:

The arrangement of the above atom is due to their atomicity and electronegativity of the given compounds.

From (1) we will realize that Bromine (Br) possesses the greatest priority because its atomic number is the highest. This is followed by oxygen (O) in CH₂OH since atomic no 8 is higher than that of Nitrogen N(7). Lastly, CH₃ has the only hydrogen attached to it with the atomic no of (1)

In the second part of the question>

The electronegativity of an element increases across the period and down the group. Fluorine is highly electronegative and contains the highest atomic number of oxygen in -CHO. The oxygen (O) in -CHO has a double bond which gives an edge over the (O) in CH₂OH. Lastly, CH₃ contains a substituted hydrogen atom

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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The percentage by mass of hydrogen can be calculated from the problem as 2.016

To calculate the mass percent of an atom in a compound, you first need to determine the molar mass of the compound and the molar mass of the atom of interest.

Determine the molar mass of the compound by adding up the atomic masses of all the atoms in the compound.

Determine the number of moles of the atom of interest in one mole of the compound. This is done by dividing the atomic mass of the atom by the molar mass of the compound.

We know that the relative molecular mas of the compound is; 300 g/mol

Then;

Percent by mass of hydrogen is; 6/300 * 100/1

= 2.016%

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The evidence from the article highlights these practices as effective means of improving water quality. By implementing these measures, both individuals and governmental agencies can contribute to the preservation and protection of water resources.

According to the article, there are several practices that members of the public and governmental agencies can adopt to improve water quality:

Implementing proper wastewater management: This involves treating wastewater before it is released back into the environment. The article emphasizes the importance of implementing advanced treatment technologies to remove pollutants effectively.Promoting sustainable agriculture: The article highlights the significance of adopting practices that minimize the use of fertilizers and pesticides, such as precision agriculture techniques. These practices can reduce the runoff of agricultural chemicals into water bodies.Establishing buffer zones: Creating vegetated buffer zones along rivers, lakes, and streams can help filter and absorb pollutants, preventing them from entering the water bodies. The article suggests that buffer zones should be implemented to reduce sediment, nutrient, and pesticide runoff from adjacent fields.Encouraging responsible industrial practices: The article emphasizes the need for industries to adopt eco-friendly practices, including proper disposal of industrial waste and the use of environmentally friendly production techniques.

Raising awareness and education: Public education campaigns can play a crucial role in improving water quality. The article suggests that educating the public about the impact of their actions on water bodies and providing information on sustainable practices can lead to positive changes.

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Answer:

Lake pontchartrain

Explanation:

The final temperature of the water is: T_final = 45.0°C

We can use the formula for the specific heat capacity of the water to solve this problem:

q = mcΔT

First, we can calculate the initial energy of the water:

q = mcΔT

q = (10.0 g) (4.184 J/g°C) (25.0°C)

q = 1,046 J

Next, we can calculate the final temperature after absorbing 840 J:

q = mcΔT

840 J = (10.0 g) (4.184 J/g°C) (ΔT)

ΔT = 20.0°C

Therefore, the final temperature of the water is:

T_final = T_initial + ΔT

T_final = 25.0°C + 20.0°C

T_final = 45.0°C

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Answer:

the correct answer to your question is b

The metal X has an approximate molar mass of 42.36 g/mol and the metal is most likely calcium.

The molar mass of the metal carbonate XCO₃ and identify the metal X, we need to calculate the number of moles of XCO₃ and CO₂ using the given masses and molar masses.

The molar mass of CO₂ (carbon dioxide) is 12.011 g/mol (for carbon) + 2 * 15.999 g/mol (for oxygen) = 44.01 g/mol.

The number of moles of CO₂ can be calculated using the formula:

moles of CO₂ = mass of CO₂ / molar mass of CO₂

moles of CO₂ = 0.855 g / 44.01 g/mol

moles of CO₂ ≈ 0.01944 mol

Since the reaction stoichiometry is 1:1 between XCO₃ and CO₂, the number of moles of XCO₃ is also approximately 0.01944 mol.

molar mass of XCO₃ = mass of XCO₃ / moles of XCO₃

molar mass of XCO₃ = 2.012 g / 0.01944 mol

molar mass of XCO₃ ≈ 103.38 g/mol

The molar mass of XCO₃ is approximately 103.38 g/mol.

To determine the metal X:

molar mass of X = molar mass of XCO3 - molar mass of CO3

molar mass of X = 103.38 g/mol - (12.011 g/mol + 3 * 15.999 g/mol)

molar mass of X ≈ 42.36 g/mol

Metal X is most likely Calcium that has a molar mass of 40 g/mol

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The liters would we need to make the 1 M solution if we have 6 mol of sodium hydroxide of 6 L.

The moles of the sodium hydroxide = 6 mol

The molarity of the sodium hydroxide = 1 M

The expression for the molarity is as follows :

The molarity = moles / volume in L

The volume of the sodium hydroxide = moles / molarity

The volume of the sodium hydroxide = 6 / 1

The volume of the sodium hydroxide = 6 L.

Thus the volume of the sodium hydroxide is 6L in the 1 M of the solution.

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Answer:

1.37x10²⁵atoms of carbon

2.74x10²⁵ atoms of oxygen.

33.7g of KNO₃

Explanation:

To answer this question you must use molar mass of carbon dioxide (44g/mol) and 1 mole are 6.022x10²³atoms.

1.00kg are 1000g of CO₂. Moles are:

1000g CO₂ * (1mol / 44g) = 22.73 moles of CO₂ = 22.73 moles of carbon.

In atoms:

22.73 moles C * (6.022x10²³atoms / 1mole) = 1.37x10²⁵atoms of carbon

There are 22.73 moles of CO₂ * 2 = 45.45 moles of oxygen are present in the carbon dioxide. In atoms:

45.45 moles Oxygen * (6.022x10²³atoms / 1mole) = 2.74x10²⁵ atoms of oxygen.

1 mole of Potassium nitrate, KNO₃, contains 3 moles of oxygen. 1 mol of oxygen are:

1.00 mol O * (1mol KNO₃ / 3 moles O) = 0.33 moles of KNO₃

As molar mass of KNO₃ is 101.1g/mol:

0.33 moles of KNO₃ * (101.1g / mol) = 33.7g of KNO₃

Answer:

1. 1.37 * 10^25 atoms of carbon

2. 2.74 * 10^25 atoms of oxygen

3. 33.67g of Potassium Nitrate

Explanation:

2. Firstly, we want to know the number of atoms of oxygen in 1 kg of carbon dioxide.

Firstly, we will need to know the number of moles of carbon iv oxide in 1kg of carbon iv oxide

Mathematically;

number of moles = mass/molar mass

molar mass of carbon iv oxide is 44 g/mol

mass here is 1000g (1kg is 1000g)

So the number of moles of CO2 in 1kg of CO2 will be; 1000/44 = 22.73 moles

Now 1 mole of CO2 contains 2 atoms of oxygen, thus 1 mole of CO2 contains 2 moles of oxygen

So the number of moles of oxygen in 1kg CO2 will be 2 * 22.73 = 45.46 moles

Mathematically, 1 mole contains 6.02 * 10^23 atoms

So 45.46 moles will contain =

6.02 * 10^23 * 45.46 = 2.74 * 10^25 atoms of oxygen

1. 1 mole of co2 contains 1 atom of carbon , thus, 1 mole of CO2 will

contain 1 mole of carbon

From above, 1kg of carbon iv oxide contains 22.73 moles , thus 1kg of carbon iv oxide will contain 22.73 moles of carbon too

So the number of atoms will be 22.73 * 6.02 * 10^23 = 1.37 * 10^25 atoms

3. Mass of KNO3 that contains 1 mole of oxygen atom

From the formula of the compound, we can see that 1 mole of KNO3 contains 3 atoms of oxygen which translates to 3 moles of oxygen

So 1 mole of oxygen will translate to 1/3 mole of KNO3

Mathematically;

mass = number of moles * molar mass

Molar mass of KNO3 = 39 + 14 + 3(16) = 39 + 14 + 48 = 101 g/mol

So the mass will be = 1/3 * 101 = 33.67g

The concentration of the solution in molarity, given that 6.802×10²⁰ particles were dissolved in 0.38 L of water is 3.0×10⁻³ M (option B)

First, we shall determine the number of mole that contains 6.802×10²⁰ particles of Mn(NO₃)₃. Details below:

From Avogadro's hypothesis,

6.022×10²³ particles = 1 mole of Mn(NO₃)₃

Therefore, we can say that

6.802×10²⁰ particles = 6.802×10²⁰ / 6.022×10²³

6.802×10²⁰ particles = 0.001 mole of Mn(NO₃)₃

Finally, we shall obtain the molarity of the solution. Details below:

Molarity of solution = mole / volume

Molarity of solution = 0.001 / 0.38

Molarity of solution = 3.0×10⁻³ M (option B)

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1. Water begins to boil - Endothermic

2. Fireworks explode - Exothermic

3. Sweat evaporates cooling your skin - Endothermic

4. Water begins to freeze into ice - Exothermic

5. You ignite your homework assignments once the year is over - Exothermic

6.Sunrays burn your skin - Exothermic

7.Cellular respiration - Exothermic

Exothermic and endothermic refer to two types of chemical reactions or physical processes that release or absorb energy, respectively.

Exothermic reactions release energy in the form of heat, light, or sound. When these reactions occur, they produce a net release of energy into the surroundings, which can often be felt as an increase in temperature. Examples of exothermic reactions include combustion, oxidation, and many types of explosions.

Endothermic reactions, on the other hand, absorb energy from the surroundings in order to proceed. These reactions typically feel cold to the touch and require energy to be added to the system in order to occur. Examples of endothermic reactions include melting, evaporation, and many types of chemical reactions that require heat to be added in order to proceed.

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An automobile tire is inflated to a pressure of 28.5 psi which is equal to the 1.93930997 atm ,196.500583 kilopascals ,1473.8775 inches Hg, 1473.8 millimeters Hg, 1473.87558 torr.

or 28.5 psi = 1.93930997 atm

                  = 196.500583 kilopascals

                  = 1473.8775 inches Hg

                  = 1473.8 millimeters Hg

                  = 1473.87558 torr

The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure (symbol: p or P). 445 The pressure relative to the surrounding air is known as gauge pressure, also written gage pressure.

A common mechanical quantity is pressure. Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by a unit of area; the standard unit of pressure in the imperial and U.S. customary systems is the pound-force per square inch (psi), which is equivalent to one newton per square meter (N/m2) in the SI. Standard atmospheric pressure, which is equal to the atmosphere's (atm) pressure, is another way to express pressure.

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Answer: Nickel has one more proton.

Explanation:

The Periodic table orders elements based on their atomic number not by their atomic mass even though this order usually coincides with the atomic masses of the elements. Occasionally however, this is not the case as is proven by Cobalt and Nickel.

The atomic number of an element refers to the number of protons that the element has in its nucleus. Cobalt has 27 protons whilst Nickel has one more proton at 28 which is why it comes after Cobalt.

Answer:

lower density

Explanation:

Answer:

only molecules with polar bonds may have a permanent dipole moment.

Explanation:

Answer:

1.An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of positively-charged protons and electrically neutral neutrons with negatively-charged electrons orbiting this nucleus.

2.a chemical process is a method or means of somehow changing one or more chemicals or chemical compounds.

3. a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

Answer:

See explanation

Explanation:

Number of moles of each gas is

Nitrogen = 15/28 = 0.536 kmoles

Helium = 5/4  = 1.25 kmoles

Methane = 60/16 = 3.75 kmoles

Ethane =    20/30 = 0.67 kmoles

Total number of moles =  0.536 kmoles + 1.25 kmoles + 3.75 kmoles +  0.67 kmoles = 6.206 kmoles

Mole fraction of each gas;

Nitrogen = 0.536 kmoles/6.206 kmoles = 0.086

Helium = 1.25 kmoles/6.206 kmoles = 0.201

Methane = 3.75 kmoles/6.206 kmoles =0.604

Ethane = 0.67 kmoles/6.206 kmoles =0.108

Partial pressure of each gas;

Nitrogen = 0.086 * 1200 kPa = 103.2 kPa

Helium = 0.201 * 1200 kPa = 241.2 kPa

Methane = 0.604 * 1200 kPa = 724.8 kPa

Ethane = 0.108 * 1200 kPa = 129.6 kPa

Apparent specific heat at constant pressure;

Cp = (0.15 * 1.039) + (0.05 * 5.1926) + ( 0.6 * 2.2537) + (0.2 * 1.7662)

Cp = 2.12 KJ Kg-1 K-1

Cv = Cp- Ru/M

Cv= 2.12 - 8.314/16.12 = 1.604 KJ Kg-1 K-1

Explanation:

kinetic energy = ½mv²

1800 = ½ × m × 11.2²

1800 = ½ × m × 125.44

3600 = 125.44m

m = 3600/125.44

m = 28.7 Kg

The charge on the ions in an ionic compound containing cobalt(III) and fluoride ions is Co³⁺ and F⁻¹ and the formula of the compound is CoF₃.

Ionic compounds are a type of chemical compound where the oppositely-charged ions of a metal and a nonmetal are attracted to each other to form an ionic bond.

The compound formed from the bonded ions will have very different properties from the elements that make up the compound.

While atoms are neutral because they have an equal number of protons and electrons, ions have a net charge and result when an atom loses or gains electrons.

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If we remove some solid silver chloride the equilibrium will react to decrease the concentration of silver cation.

According to Le Chatelier's Principle, the system at equilibrium will react to a stress placed on the position of the equilibrium in such a way as to minimize this stress. The position of the equilibrium will shift in response to a stress placed on either the reactant or the product side.

            Ag+ (aq.) + Cl- (aq.) ⇌ AgCl (s)

Equilibrium is a state of balance between opposing forces or actions that is either static or dynamic. If we remove the salt it will cause the concentration of aqueous silver cations to increase. This will place a stress on the position of the solubility equilibrium. Then the equilibrium will react in such a way as to decrease the concentration of silver cations. We have to shift to the left since the reverse reaction.

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