(Solved): Hydrogen gas can be produced from the reaction of calcium hydride and water. \[ \mathrm{CaH}_{2}(\m ...

Hydrogen gas can be produced from the reaction of calcium hydride and water. \[ \mathrm{CaH}_{2}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\ell) \rightarrow 2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{Ca}(\mathrm{OH})_{2}(\mathrm{aq}) \] How many grams of caicium hydride are needed to produce \( 3.88 \mathrm{~L} \) of hydrogen gas collected over water at \( 22.0^{\circ} \mathrm{C} \) and a total pressure of \( 769.0 \) tor? The vapor pressure of water at \( 22.0^{\circ} \mathrm{C} \) is \( 19.827 \) tort. \[ R=0.08206 \frac{L \mathrm{ctan}}{\mathrm{mad} K} \] Answer: