Mole Conversions (PreAP)

What is the relationship between moles and mass?

• Mass (g) = Moles x Molar Mass (g/mol)

• Mass (g) = Moles / Molar Mass (g/mol)

• Mass (g) = Molar Mass (g/mol) / Moles

• Mass (g) = Moles + Molar Mass (g/mol)

What is the molar mass of a substance?

• The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

• The weight of a single atom of a substance.

• The total volume occupied by one mole of a substance.

• The density of a substance at standard temperature and pressure.

How do you determine the number of moles from a given volume of a gas?

• Moles = Volume (L) / 22.4 L/mol at STP

• Moles = Volume (L) * 22.4 L/mol at STP

• Moles = Volume (L) + 22.4 L/mol at STP

• Moles = Volume (L) - 22.4 L/mol at STP

How do you calculate the number of molecules in a given mass of a substance?

• Convert the mass to moles using the molar mass, then multiply the number of moles by Avogadro's number.

• Multiply the mass by the molar mass to get the number of molecules directly.

• Divide the mass by the molar mass to find the number of molecules.

• Use the density of the substance to calculate the number of molecules.

What is Avogadro's number?

• 6.022 x 10^23

• 3.14159 x 10^22

• 1.602 x 10^-19

• 9.109 x 10^-31

What is a mole in chemistry?

• A unit of measurement for temperature.

• A unit of measurement used to express the amount of a substance.

• A type of chemical reaction.

• A measure of the volume of a gas.

What is the significance of STP in gas calculations?

• STP is used to measure the density of liquids.

• STP provides a reference point for gas calculations, allowing for consistent measurements of gas volume.

• STP is a method for calculating the speed of sound in gases.

• STP is a standard for measuring the temperature of solids.

What is the mass of 1 mole of carbon dioxide (CO2)?

• 42.00 g

• 44.01 g

• 46.00 g

• 40.00 g

What is the volume of one mole of gas at standard temperature and pressure (STP)?

• 20.0 liters

• 22.4 liters

• 24.5 liters

• 18.0 liters

How do you convert liters of gas to moles?

• Moles = Volume (L) / 22.4 L/mol

• Moles = Volume (L) * 22.4 L/mol

• Moles = Volume (L) + 22.4 L/mol

• Moles = Volume (L) - 22.4 L/mol