Homework Help: Chemistry Help!!

Posted by Maci on Wednesday, October 12, 2011 at 1:47pm.

Propane(C3H8), the major component of LP game, is often used as heating and cooking fuels in homes. When propane is burned( reacted with oxygen), CO2(g) and H2O(g) are produced.
1) Write an equation for the reaction and calculate the enthalpy change for the combustion of propane.
2) How much heat can be produced by the combustion of 50.0 g propane?

Chemistry Help!! - DrBob222, Wednesday, October 12, 2011 at 2:21pm
C3H8 + 5O2 ==> 3CO2 + 4H2O

I suppose you want the standard enthalpy change using delta Hf values.
delta Hrxn = (n*DHfproducts)-(n*DHfreactants)
Chemistry Help!! - Maci, Wednesday, October 12, 2011 at 2:25pm
whatever is easier!
Chemistry Help!! - DrBob222, Wednesday, October 12, 2011 at 3:41pm
Look up delta Hf for CO2 and multiply by n. Look up delta Hf for H2O an multiply by n. Look up delta Hf for C3H8 and multiply by n. Then
DHrxn = (n*DHproducts)-(n*DHreactants). That gives you delta H for the combustion of propane.
For the second part,
q = DHrxn x (50g/molar mass propane)

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