Molar Mass Calculation

Calculate the molar mass of H2O.

• 22.99 g/mol

• 18.02 g/mol

• 20.01 g/mol

• 16.04 g/mol

Answer explanation

The molar mass of H2O is 18.02 g/mol, which corresponds to the correct answer choice.

What is the molar mass of CO2?

• 22.01 g/mol

• 44.01 g/mol

• 55.00 g/mol

• 33.02 g/mol

Answer explanation

The molar mass of CO2 is 44.01 g/mol. It is calculated by adding the atomic masses of carbon and oxygen in one molecule of CO2.

Find the molar mass of NaCl.

• 17.00 g/mol

• 40.08 g/mol

• 23.00 g/mol

• 58.44 g/mol

Answer explanation

The molar mass of NaCl is 58.44 g/mol. This is the correct choice because it represents the combined atomic masses of sodium (Na) and chlorine (Cl) in one mole of NaCl.

Determine the molar mass of CaCO3.

• 32.00 g/mol

• 56.44 g/mol

• 75.36 g/mol

• 100.09 g/mol

Answer explanation

The molar mass of CaCO3 is 100.09 g/mol, which corresponds to the correct answer choice.

What is the molar mass of CH4?

• 22.99 g/mol

• 18.02 g/mol

• 16.04 g/mol

• 12.01 g/mol

Answer explanation

The molar mass of CH4 is 16.04 g/mol. It is calculated by adding the atomic masses of carbon (12.01 g/mol) and hydrogen (1.01 g/mol) in one molecule of CH4.

Calculate the molar mass of H2SO4.

• 60.03 g/mol

• 32.06 g/mol

• 45.34 g/mol

• 98.08 g/mol

Answer explanation

The molar mass of H2SO4 is 98.08 g/mol, which corresponds to the correct answer choice.

Find the molar mass of Al2(SO4)3.

• 183.56 g/mol

• 342.15 g/mol

• 256.78 g/mol

• 421.93 g/mol

Answer explanation

The molar mass of Al2(SO4)3 is 342.15 g/mol, which corresponds to the correct answer choice.

Determine the molar mass of C6H12O6.

• 240.24 g/mol

• 180.16 g/mol

• 90.08 g/mol

• 360.32 g/mol

Answer explanation

The molar mass of C6H12O6 is calculated by adding the atomic masses of all its constituent atoms. The correct choice, 180.16 g/mol, is obtained by adding the atomic masses of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

What is the molar mass of NH4NO3?

• 56.077 g/mol

• 92.159 g/mol

• 104.215 g/mol

• 80.043 g/mol

Answer explanation

The molar mass of NH4NO3 is 80.043 g/mol. This is the correct choice.

Calculate the molar mass of Fe(NO3)3.

• 178.45 g/mol

• 241.86 g/mol

• 312.79 g/mol

• 56.87 g/mol

Answer explanation

The molar mass of Fe(NO3)3 is calculated by adding the atomic masses of each element in the compound. The correct choice, 241.86 g/mol, is obtained by adding the atomic masses of Fe, N, and O in the compound.