Converting grams to kilojoules.

Burning 2.00g of propane, C3H8, produces 99.78 kJ of energy. How much energy is produced when one mole of the propane burns?

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...e the problem:
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<br>You know that 2.00 g of propane produces 99.78 kJ of energy.
<br>You can either convert 2.00 g of propane to # moles of propane, or figure out how many grams of propane are in one mole of propane; either way you will need to know the molecular weight of propane.
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<br>Propane: C3H8 mw = 3xMW ...