How many times more heat will be released with the complete combustion of hydrogen with a mass of 5 kg than with
| September 5, 2021 | education
How many times more heat will be released with the complete combustion of hydrogen with a mass of 5 kg than with the complete combustion of dry birch firewood of the same mass?
m1 = m2 = 5 kilograms – the mass of hydrogen and birch firewood;
q1 = 120 * 10 ^ 6 J / kg – specific heat of combustion of hydrogen;
q2 = 15 * 10 ^ 6 J / kg – specific heat of combustion of firewood.
It is required to determine the ratio of the obtained thermal energy from the combustion of substances Q1 / Q2.
Q1 / Q2 = q1 * m / (q2 * m) = q1 / q2 = 120 * 10 ^ 6 / (15 * 10 ^ 6) = 120/15 = 8 times.
Answer: when hydrogen burns, heat will be released 8 times more than firewood.
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