First covert grams of oxygen to moles of O2 using the molecular weight of O2 (32 g/mol), then use the balanced equation as a conversion factor (1 mol O2 per 1 mol of K2O2), then use the molecular weight of K2O2 (110 g/mol) to get get grams of K2O2.
0.294 g O2 (1 mol O2 / 32 g O2) (1 mol K2O2 / 1 mol O2)( 110 g K2O2 / 1 mol K2O2) = 1.01 g K2O2
Zn + Cl2 --> ZnCl2 (if the valence charge on Zn is +2, which it usually is)
2 Al + 6 HF ---> 2 AlF3 + 3 H2
Jan 2nd, 2015
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