What mass (in grams) of sodium hydride will produce hydrogen gas?

Question

Sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas. What mass(in grams) of sodium hydride wil produce 982mL of gas at 28.0°C and 765 torr total pressure, when the gass is collected above water? The vapor pressure of water at this experiment is 28 torr.


please explain in detail if you can. thanx

Answer 1

NaH + H2O -> NaOH + H2

moles of gas = 3.04 moles

Thus mass of NaH = 24*3.04 g = 72.96 g