Homework Help: chemistry

Posted by sarah on Sunday, March 28, 2010 at 2:32am.

While researching energy values of fuels, a chemist designed an experiment to find out the heat of combustion of pentane. Using the known hexane heat of combustion of hexane = 4650kJ/mol and the data below calculate the heat of combustion of pentane.

Set up= copper beaker 42.5g filled with 500ml water and spirit burner underneath

DATA:
Initial temp= 26, final temp = 28.75 mass hexane = 10.11g

Initial temp= 26, final temp = 27.33 mass pentane = 8.15g

Specific heat capacity water= 4.18 and copper=0.39

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