Question

Need help for test question
Calculate heat given off when 100g of C7H8(l) burns. The heat of formation is 59.9 kJ/mol for C7H8.

I did 100g*(1 mol/92.13842g)*(50.0kJ/ mol) = 54.27 kJ

I know I did it wrong, but I don't know where. Can someone please point it out? Thanks.

Answer 1

can u give me molecular weight of C7H8

Answer 2

92.18 g burning gives rise to 59.9 K J
100 g gives =59.9*100 /92.18
=64.98 KJ

Answer 3

got it now ur mistake ???

Answer 4

Yes thank you

Answer 5

ur welcome :)