How many moles of sodium oxide will be produced when 10 moles of sodium react with oxygen?

1 Answer


#"2.5 mol O"_2#


First, write a balanced equation

#4"Na" + "O"_2 -> 2"Na"_2"O"#

Then multiply the mols of #"Na"# given in the question by the mol ratio. In this case, the mole ratio is

#("1 mol O"_2) / ("4 mol Na")#

Remember what you want in the answer should be in the numerator and what is given in the question should be in the denominator so it cancels out.

#10 cancel("mol Na") * ("1 mol O"_2) / (4 cancel("mol Na")) = "2.5 mol O"_2#