Calcium Hydride reacts with water to produce hydrogen gas:
CaH2(s) + H2O (l)---> Ca(OH)2 (aq) + H2
This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired. How many grams of CaH2 are needed to generate 10.0L of H2 gas if the pressure is 740mmHg are 23 degrees Celsius?
chemistry homework help!! - DrBob222, Thursday, February 16, 2012 at 9:42pm
I don't know anything about this R you quote. Work it the long way.
Here's an example. Find mole H2 from PV = nRT
chemistry homework help!! - Natalie, Sunday, December 7, 2014 at 10:13am
CaH2 + 2H2O = Ca(OH)2 + 2H2
H2: P:.97 atm T: 296K V: 10L
.4 mol H2 (1molCaH2/2mol H2)(1mol/42g) = 8.4 g CaH2