2. Atoms & Elements

What is the mass (in grams) of 10.00 L of propane vapor (C3H8) at standard temperature and pressure (STP)?

How many grams of Fe_2O_3 are present in 0.500 mole of Fe_2O_3?

What is the mass, in grams, of 2.50 mol of iron(II) hydroxide, Fe(OH)2?

If you have 644 grams of retinol (C20H30O), how many moles of retinol do you have?

A 42.7 gram sample of potassium nitrate (KNO_3) contains how many grams of potassium?

What is the mass, in grams, of 202 atoms of iron (Fe)? (1 mol of Fe has a mass of 55.85 g; Avogadro's number is 6.022 × 10^{23} atoms/mol.)

Which of the following best defines molar mass?

What is the mass of 9.45 mol of aluminum oxide (Al_2O_3)?

How many carbon atoms are present in 77.28 g of ethane (C2H6)?

What is the molar mass of CHCl_3?

Given a 10.0 g sample of O_2 gas, what is the molar mass of oxygen (O_2)?

What is the molar mass of aluminum (Al)?

The heat of combustion of hydrogen gas is –286 kJ/mol. What is this value expressed in kJ/g?

What is the molar mass of MgSO_4?

How many grams are present in 3.7 moles of Na2O?