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# Thread: Chemistry Help Reps (srs)

1. ## Chemistry Help Reps (srs)

A chemical engineer studying the properties of fuels placed 1.520 g of hydrocarbon in the bomb of a calorimeter and filled it with 02 gass. The bomb was immersed in 2.550 L of water and the reatcion initiated. The water temp rose from 20 to 23.55 C. If the calorimeter had a heat capcity of 403 J.K, what was the heat of reaction from combustion per gram of the fuel?

...it's for a friend, who's about to give up. I can't help it...It's in my nature to help. If you could show work, too. I'd appreciate it, guys.

2. Not 100%sure, I haven't done this stuff in a while, but I'll take a shot at it

qrxn=-(qwater + qcalorimeter)
qrxn = -(mcDTwater + mcDTcalorimeter)
qrxn = -[(2.550kg x 4186J/kgK x 3.55K) + (403J/K x 3.55K)]
qrxn = -39324.415

since this is for 1.520 g, divide the answer above by 1.520

Hope that's right, sorry if it's not but hopefully it will get him on the right track either way

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