2. Atoms & Elements

How many oxygen atoms are present in one formula unit of Mg(OH)_2?

How many hydrogen atoms are present in three formula units of ammonium benzoate, C6H5COONH4?

What is the mass (in grams) of 3.99 moles of krypton (Kr)?

Which conversion factor should you use to convert moles of sodium (Na) to the mass of sodium?

How many grams of NaCl (molar mass = 58.44 g/mol) are needed to prepare 1.00 mol of Na+ ions?

What is the molar mass of Na_2SO_4 (sodium sulfate)?

How many formula units are present in 3.6 grams of NaCl?

What is the molar mass of NaNO3?

How many moles are present in 25.3 g of potassium nitrate (KNO3)? (Molar mass of KNO3 = 101.1 g/mol)

How many atoms of nitrogen are present in 218 g of dinitrogen pentoxide (N2O5)?

What is the mass of 3.50 mol of Zn atoms?

What is the molar mass of iron(III) chloride, FeCl_3?

What is the molar mass of copper (Cu) in grams per mole?

What is the molar mass of potassium nitrate (KNO_3)?

What is the molar mass of CO_2?