Phosphine, PH 3 , has a foul odor and irritates the respiratory system. The reaction of calcium

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Phosphine, PH3, has a foul odor and irritates the respiratory system. The reaction of calcium phosphide and water gives phosphine gas and aqueous calcium hydroxide. 

Ca3P2(s) + H2O(l) → PH3(g) + Ca(OH)2(aq) 

If 3.50 L of phosphine gas is collected at 749 mm Hg and 25 °C, what mass of calcium phosphide underwent reaction?

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