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Consider the following reaction:

2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O

How many grams of O2 are needed to make 432.7 g of H2O?

1 answer

mols H2O = grams/molar mass = ?
Use the coefficients to convert mols H2O to mols O2.
Now convert mols O2 to grams O2. g O2 = mols O2 x molar mass O2

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