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How many grams of Butane (C4H10) must be burned to release 6375 KJ of heat?
Given: Molar mass of C4H10 =

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Kell

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    So you need to find out how many moles of butane you need first:

    6,375 kJ/mole / 2657 kJ = 2.40 moles

    Multiply that times the molecular weight and you are done!

    2.40 x 58 g/mole = 139 g answer is b)

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