Lithium hydride reacts with water as follows.

LiH(s) + H2O(l) -->LiOH(aq) + H2(g)

During World War II, U.S. pilots carried LiH tablets. In the event of a crash landing at sea, the LiH would react with the seawater and fill their life belts and lifeboats with hydrogen gas. How many grams of LiH are needed to fill a 3.6 L life belt with hydrogen gas at 1.04 atm and 27.7°C?

1 answer

Follow the steps of this worked example.
http://www.jiskha.com/science/chemistry/stoichiometry.html