2. Atoms & Elements

A compound has a molar mass of 180 g/mol and the following composition by mass: 40.0% C, 6.7% H, and 53.3% O. What is the molecular formula of the compound?

1 mole of which of the following will have the largest mass?

Which of the following is the correct molar mass of calcium carbonate (CaCO_3)?

How many molecules of sulfur trioxide (SO_3) are present in a 78.0 g sample?

What is the mass, in grams, of 8 moles of sodium chloride (NaCl)?

What is the molar mass of calcium carbonate (CaCO_3)?

A 500. mL flask is filled with 2.00 g of an unknown gas at standard temperature and pressure (STP). What is the molar mass of the gas?

What is the mass in grams of a single molecule of sucrose (C_{12}H_{22}O_{11})?

Given that a sample of an element has a mass of 10.4 grams and contains 0.129 moles, what is the molar mass of the element?

Which of the following is the correct molar mass of H2O?

If the molar mass of methanol (CH_3OH) is 32.04 g/mol, what is the mass of a sample containing 56.6 moles of methanol?

Which of the following is the molar mass of aluminum (Al)?

What is the mass of 7.00 mol of silver nitrate (AgNO_3)?

What is the molar mass of chlorine gas (Cl_2)?

A sample contains 7.5 g of CaCl2·9H2O. How many grams of pure CaCl2 are present in this sample?