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If the heat of combustion for a specific compound is -1450.0 kJ/mol and its molar mass...

If the heat of combustion for a specific compound is -1450.0 kJ/mol and its molar mass is 91.49 g/mol, how many grams of this compound must you burn to release 485.30 kJ of heat?

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Answer #1

Given heat of combustion is -1450.0 kJ/mol

That means 1 mole of compound upon combustion releases 1450.0 kJ of heat

   91.49 g of compound upon combustion releases 1450.0 kJ of heat

                 M g of compound upon combustion releases 485.30 kJ of heat

                         M = ( 485.30x91.49) / 1450.0

                             = 30.62 g

Therefore the mass of the compound required is 30.62 g

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