Homework Help: chemistry homework help!!

Posted by danielle on Thursday, February 16, 2012 at 8:18pm.

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?

R=62.36 L.mmHg/mol.K

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
http://www.jiskha.com/science/chemistry/stoichiometry.html

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