How many grams of A must have decomposed if 21.53 grams of Y are formed according to the reaction below? 5A → X + 3Y Assume that the molar mass of A is 35.00 g/mol, the molar mass of X is 100.00 g/mol, and the molar mass of Y is 25.00 g/mol.  Enter your answer with four significant figures. Do not enter the grams units, just the number.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".