Sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas: CaH2 (s) + 2H2O (l) ? Ca(OH)2 (aq) + 2H2 (g) A sample of CaH2 weighing __________ g will produce 982 mL of gas at 28.0 °C and 765 torr, when the hydrogen is collected over water. The vapor pressure of water at this temperature is 28 torr. a. 0.811 b. 0.0385 c. 925 d. 0.845 e. 1.62
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