Given: m (mass of burnt natural gas) = 500 g (0.5 kg).
Reference values: q (specific heat of combustion of natural gas) = 44 * 10 ^ 6 J / kg.
The released amount of heat during the complete combustion of natural gas will be equal to the product of its mass and specific heat of combustion: Q = q * m.
Calculation: Q = 44 * 10 ^ 6 * 0.5 = 22 * 10 ^ 6 J (22 MJ).
Answer: 22 MJ of heat will be released.
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