CHEM 20A Final Review

Front

What is the molar mass of fluorine gas (F2)?

Back

The molar mass of fluorine gas (F2) is approximately 38.00 g/mol.

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit of measurement that represents 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.022 x 10^23) is the number of atoms, molecules, or particles in one mole of a substance.

Front

How many moles are in 1.00 g of water (H2O)?

Back

1.00 g of water contains approximately 0.0555 moles (molar mass of H2O is 18.02 g/mol).

Front

What is the formula to convert grams to moles?

Back

Moles = grams / molar mass.

Front

What is the molar mass of oxygen gas (O2)?

Back

The molar mass of oxygen gas (O2) is approximately 32.00 g/mol.

Front

How do you determine the mass of a substance from moles?

Back

Mass (g) = moles x molar mass (g/mol).

Front

What is the relationship between moles and volume for gases at STP?

Back

At STP (Standard Temperature and Pressure), 1 mole of an ideal gas occupies 22.4 liters.

Front

What is the definition of STP in chemistry?

Back

STP stands for Standard Temperature and Pressure, defined as 0°C (273.15 K) and 1 atm pressure.