Balanced Equation: 4Li + O2 —> = 2Li2O
Stoichiometry:
Choose a given first.
6.45g Li • 1 mole Li 2 moles Li2O 30 g. Li2O
————- • ———- • ——
7 g Li 4 moles Li** 1 mol. Li2O
** Mole to mole ratio from balanced equation
Multiple everything on top and divide by everything multiplied on bottom.
387
———- = ~ 13.8 g. Li2O
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