How much gasoline needs to be burned to get the same amount of energy as with complete combustion of 4 kg of coal?
| June 3, 2021 | education
To find the equilibrium mass of gasoline, we will use the equality: qb * mb = Q (heat received) = qу * mу, whence mb = qу * mу / qb.
Constants and variables: qу – specific heat of combustion of coal (qу = 2.7 * 10 ^ 7 J / kg); mу – mass of coal (mу = 4 kg); qb – specific heat of combustion of gasoline (qb = 4.6 * 10 ^ 7 J / kg).
Calculation: mb = qy * mu / qb = 2.7 * 10 ^ 7 * 4 / (4.6 * 10 ^ 7) = 2.35 kg.
Answer: We need to burn 2.35 kg of gasoline.
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