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Consider the following reaction:

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

How many grams of B2O3 are made by the reaction of 233.8 g of O2

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The steps are exactly the same as your previous question about H2O. You would do well to remember those steps. They work for all stoichiometry problems.

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