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How many grams of phosphine (PH 3 ) can form when 31.9 g of phosphorus and 77.2 L of hydrogen gas react at STP? P

How many grams of phosphine (PH₃) can form when 31.9 g of phosphorus and 77.2 L of hydrogen gas react at STP?

P₄(s) + 6H₂(g) 4PH₃(g)

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