How much hydrogen must be burned to obtain 180 kJ of heat?

univerkov | January 29, 2021 | education

Initial data: Q (the amount of heat that was obtained from the combustion of hydrogen) = 180 kJ (180 * 10 ^ 3 J).

Reference values: q (specific heat of combustion of hydrogen) = 120.9 MJ / kg (120.9 * 10 ^ 6 J / kg).

The mass of hydrogen that needs to be burned is determined by the formula: Q = q * m, whence m = Q / q.

Calculation: m = 180 * 10 ^ 3 / (120.9 * 10 ^ 6) = 0.00149 kg (1.49 g).

Answer: You will need to burn 1.49 g of hydrogen.

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