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In 2H2 + O2 -> 2H2O, what mass of O2 reacts completely with 4 g of H2?
A32 g
B64 g
C8 g
D16 g
Answer & Solution
Correct answer: A. 32 g
4 g of H2 is 2 mol, which needs 1 mol of O2, and 1 mol of O2 weighs 32 g.
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