Chemistry
posted by Lisa on .
Energy, q, w, Enthalpy, and StoichiometrySource(s):
Consider the combustion of liquid methanol, CH3OH (l).
CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = 726.5 kJ
Part A:
What is the enthalpy change for the reverse reaction?
Express your answer using four significant figures.
Answer I got right: 726.5 kJ
Part B:
Balance the forward reaction with wholenumber coefficients:
CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H
Answer I got right: 2,3,2,4
Part C:
What is for the reaction represented by this equation?
Express your answer using four significant figures.
Answer : I am stuck. ?????

Opps I left off what is H
Part C:
What is H for the reaction represented by this equation?
Express your answer using four significant figures.
Answer : I am stuck. ????? 
I think it is this but not sure.
+ 726.4 kJ 
I'm stuck but not as much as before. I keep looking for WORDS like combustion, equilibrium, etc but the "ans to 4 s.f." means they want a number. Perhaps the number is 726.5kJ/mol*2 = 1453 kJ. I'm still in the dark if this isn't right.

Now it makes sense with the H. The delta H for the doubled equation is 2*delta H for the original and the 1453 kJ should give you the correct answer.

thank you that is the answer. 1453
It was driving crazy. 
I did not * 2 just one simple step will mess ya up lol.. thanks for your help... your awesome.

My answer is +239

Finally achieved a gr8 success my ans is 239