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Topic: Quick assistance needed on chemistry heat question  (Read 6744 times)

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Offline Gweedo8

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Quick assistance needed on chemistry heat question
« on: July 06, 2009, 04:59:17 PM »
What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction?

2C6H6(l)+15O2(g)-->12CO2(G)+6H2O(g)     :delta:Hrxn=-6278kj

Offline sjb

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Re: Quick assistance needed on chemistry heat question
« Reply #1 on: July 06, 2009, 05:09:28 PM »
Well, 1.5 x 103 kJ = 154.5 kJ.

Your reaction gives off 3139 kJ mol-1 of benzene, so how many moles of benzene do you need? Which is what mass of benzene, and so what volume?


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