When heated, elemental phosphorus, P4, produces phosphine, PH3, and phosphoric acid, H3PO4. How many grams of phosphine are produced if 56 grams of P4 have reacted?

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When heated, elemental phosphorus, P4, produces phosphine, PH3, and phosphoric acid, H3PO4.How many grams of phosphine are produced if 56 grams of P4 have reacted?
When heated, elemental phosphorus, P4, produces phosphine, PH3, and phosphoric acid, H3PO4? How we can balanced it?