2. Atoms & Elements

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?

What is the total number of atoms present in one formula unit of the compound Ca(ClO_3)_2?

What is the mass in grams of 42.30 moles of LiCl?

What is the molar mass of neon (Ne)? Round your answer to two decimal places. (g/mol)

If seawater contains 3.2 × 10^{-9} g of gold per liter, how many grams of gold are present in 1.00 L of seawater?

What is the molar mass of Ca(OH)_2?

What is the percent by mass of Mg in MgO?

The molar mass of nitrogen (N_2) is 28.02 g/mol. What is the mass of 2.50 moles of N_2?