Homework Help: chemistry

Posted by marcus on Wednesday, November 14, 2012 at 9:02pm.

At constant pressure and 25 degrees C, what is delta H for the reaction

2C2H6(g) + 7O2(g) --yields-- 4CO2(g) + H2O(l)

if the complete consumption of 11.3 g of C2H6 releases -586.3 kJ of heat energy?

(11.3=.38 mol C2H6)

chemistry - DrBob222, Wednesday, November 14, 2012 at 9:40pm
-586.3 kJ x (2*molar mass C2H6/11.3) = kJ for the reaction.
chemistry - marcus, Wednesday, November 14, 2012 at 10:24pm
I get -3113 as my answer when I plug in 30.6 as the molar mass when the teacher said it should be around -225 as the final answer?

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