Quiz 1 Prep

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Kim Vu 2G
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Joined: Fri Sep 25, 2015 3:00 am

Quiz 1 Prep

Postby Kim Vu 2G » Tue Jan 26, 2016 9:39 pm

For #6, What mass of propane, C3H8, must be burned to supply 2580 kJ of heat? The standard enthalpy of combustion of propane at 298K is -2220kJ/mol. I'm not sure how to approach this problem after writing out the combustion reaction.

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Joined: Wed Nov 18, 2015 3:00 am

Re: Quiz 1 Prep

Postby jenshan » Tue Jan 26, 2016 9:58 pm

You want to figure out essentially how many moles of propane will be needed to release 2580 kJ of heat.
From the combustion, the reaction releases 2220 kJ PER mole of reaction.
So you divide the amount of heat you WANT to release by the amount of heat that IS released from 1 mole of combustion, and this gives you the amount of moles needed to create 2580 kJ of heat.
From there you convert moles to grams! :)

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