2. Atoms & Elements

What is the molar mass of HCl (hydrochloric acid)?

Which of the following best describes the mass of 1 mol of atoms for an element?

What is the mass (in grams) of 7.98 moles of krypton (Kr)?

What is the molar mass of Al_2(SO_4)_3?

What is the molar mass of propane (C3H8)?

What is the molar mass of NaOH?

A 0.399 g sample of an unknown gas fills a 550. mL flask at standard temperature and pressure (STP). What is the molar mass of the gas?

Approximately how many grams of Fe2O3 are present in 0.82 mol Fe2O3?

Which of the following is the molar mass of carbon (C)?

A 1.0 mol sample of which of the following compounds has the greatest mass?

How many bromine (Br) atoms are present in 2.50 g of elemental bromine?

How many different elements are present in the chemical formula C6H12O6?

What is the molar mass of ammonia (NH_3)?

How many moles of calcium (Ca) are present in a 425 g sample of calcium?

How many bromide ions (Br^-) are present in 3.50 g of MgBr_2?