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If the heat of combustion of hexane, C6H14(g) is 4.16 x 103 kJ/mol , what is...

If the heat of combustion of hexane, C6H14(g) is 4.16 x 103 kJ/mol , what is the standard heat of formation of hexane?

Answer: -2.0 x 10^2 kj/mol please show work thank you!

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