February 26, 2017

Homework Help: Chemistry

Posted by A Canadian on Monday, February 11, 2013 at 6:51pm.

C6H14 + 19/2 O2 -> 6 CO2 + 7H2O delta H = -4163 kJ

What mass of hexane is required to produce 1.0E5 kJ of heat by complete combustion?

-4163 kJ/mol x mol C6H14 = 1E5/-4163 kJ/mol
Mol = 1E5/-4163 kJ/mol
Mol = -24 mol

I know I can do m=n x MM now, but shouldn't the value of mol in the above be positive? Or do you just take the absolute value?

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