PLZ ANSWER CHEM QUESTION

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a chemist reacted 64 grams of Ru with O2. This reaction produced 160 grams of ruthenium oxide and 4 grams of leftover O2. How much of the reactants would this scientist need to make 320 grams of the product with no leftover O2?
Ru + O2 = RuO2 + O2 leftover

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