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Question: a mass of 400 g of h2 g reacts with...

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A mass of 4.00 g of H2 (g) reacts with 2.00 g of O2 (g). If 1.94 g of H2O (l) is collected, what is the percent yield of reaction?
2H2 (g) + O2 (g) -> 2H2O (l)
a. 5.4%
b. 49%
c. 32%
d. 86%
e. 97%

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