Self-Test 8.9A

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Miya Eberlein 1J
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Joined: Fri Sep 25, 2015 3:00 am

Self-Test 8.9A

Postby Miya Eberlein 1J » Mon Jan 11, 2016 10:20 pm

Can someone help me with self-test 8.9A on page 244? I converted the number of grams of benzene, 39.1 g, to its molar mass. I then found that there are 2 mols of benzene in the sample and multiplied that by the amount of heat to get 30.8 kJ mol, even though the answer should be in kJ per mol.

Christian Torres 1A
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Re: Self-Test 8.9A

Postby Christian Torres 1A » Tue Jan 12, 2016 3:12 pm

First, you find the mols of benzene by dividing 39.1g by the molar mass, 78.116g/mol. Since enthalpy is kJ/mol and they gave you the amount of energy, 15.4 kJ, then you divide 15.4kJ by the mols of benzene which would give you something that rounds up to 30.8 kJ/mol.

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