how do i convert J/g into kJ/mol?

Im working on heat of combustion of methanol, ethanol, propanol and butanol and I have the j/g value for heat of combustion but i need to convert it in kj/mol. Help!

3 Answers

  • You need to know the molar mass of the substance in question.

    For methanol it's 32.0420 g/mol

    For ethanol it's 46.0687 g/mol

    For propanol it's 60.0953 g/mol

    For butanol it's 74.1220 g/mol

    Starting with the heat of combustion in J/g, here's what you do.

    X J/g x (1 kJ / 1000 J) x (molar mass / 1 mol)

    Be sure to multiply and divide as indicated, or you won't get the correct result.

    I hope that helps. Good luck!

  • How do i convert J/g into kJ/mol?

  • 291x10^3/26.982 J/g

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