Test your skills on the following problems.
Practice: How many molecules of hexane are contained in 55.0 mL of hexane? The density of hexane is 0.6548 g/mL and the molar mass is 86.17 g/mol.
Practice: How many SO3 ions are contained in 120.0 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.
Practice: What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 50.0 g of oxygen difluoride, OF2?
Practice: How many bromide ions are there in 4.50 moles of gallium bromide?
Practice: How many moles of oxygen atoms are required to combine with 3.05 moles of Pb to create lead (IV) phosphate?
Practice: How many cations are there in 100.0 g of lithium nitride?
Practice: Which of the following amounts would contain the least atoms?
Practice: Which of the following amounts have the most molecules?