Homework Help: chemistry

Posted by Ray on Thursday, November 4, 2010 at 10:01pm.

Propane gas is used to heat a tank of water. If the tank contains 200 L of water, what mass of propane will be required to raise its temperature from 20 degrees C to 65 degrees C. The heat of combustion for propane is -2220 kJ/mol.

chemistry - DrBob222, Thursday, November 4, 2010 at 10:07pm
How much heat do you need?
q = mass x specific heat water x (Tfinal-Tinitial).

2220 kJ/mol propane x ymols = q
Solve for y moles.
Then y moles propane x molar mass propane = grams propane.
Check my thinking.

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