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1. How many grams of phosphine (PH 3 ) gas can form when an excess of solid phosphorus P 4 reacts in a sealed chamber

1. How many grams of phosphine (PH3) gas can form when an excess of solid phosphorus P4 reacts in a sealed chamber with 46.5 liters of hydrogen H2 gas at STP?

2. The hydrogen gas evolved in a reaction between solid zinc and hydrochloric acid has been collected over water. The volume of water displaced is equal to 0.625 L. Given that the gas was collected at a temperature of 30.0C and the atmospheric pressure was 740 torr, what mass mg of hydrogen gas was collected?

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