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

1 Answer

Sena Dzirasa · Stefan V.

Mar 24, 2017

${2.5 mol O}_{2}$ $"2.5 mol O"_2$

Explanation:

First, write a balanced equation

$4 Na + O_{2} \to 2 {Na}_{2} O$ $4"Na" + "O"_2 -> 2"Na"_2"O"$

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

$\frac{{1 mol O}_{2}}{4 mol Na}$ $("1 mol O"_2) / ("4 mol Na")$

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.

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

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