I need help with a highschool chemistry question.

Use the following reaction to solve the conversion problem 2 P2O4 = P4 + 5 O2

a) how many grams of P4 could I produce from 71 grams of P2O5?
b) how many Liters of Oxygen gas could I produce from 213 grams of P2O5?
c) how many grams of P2O5 are required to produce 62 grams of P4?

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