If the combustion of 45.0 g of methane (natural gas) releases 2498 kj of heat energy, how much heat energy in kj would be released by combustion of 1.55 kg of methane?

8.60 x 10⁴ kJ

Explanation:

The energy released per gram of methane is first calculated:

(2498kJ)/(45.0g) = 55.5 kJ/g

The heat released by the combustion of 1.55 kg of methane is then calculated:

(55.5kJ/g)(1.55kg)(1000g/kg) = 86025kJ

To three significant digits, the answer is 8.60 x 10⁴ kJ.

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