Test your skills on the following problems.
Problem: 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.4m
Problem: How many SO3 ions are contained in 120.0 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.4m
Problem: What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 50.0 g of oxygen difluoride, OF2?4m
Problem: How many bromide ions are there in 4.50 moles of gallium bromide?4m
Problem: How many moles of oxygen atoms are required to combine with 3.05 moles of Pb to create lead (IV) phosphate?4m
Problem: How many cations are there in 100.0 g of lithium nitride?4m
Problem: Which of the following amounts would contain the least atoms?
a) 10.0 g Sr
b) 10.0 g Br
c) 10.0 g Mg
d) 10.0 g Li3m
Problem: Which of the following amounts have the most molecules?
a) 15.0 g N2
b) 15.0 g Br2
c) 15.0 g O2
d) 15.0 g I24m