What amount of heat is released during cooling one and a half ton of zinc from 60 C to 0 C?

What amount of heat is released during cooling one and a half ton of zinc from 60 C to 0 C? How much heat is released during the combustion of 2.5 kg of gasoline?

1) Heat during zinc cooling: Q = C * m * (t2 – t1), where C (specific heat capacity of zinc) = 400 J / (kg * K); m (mass of zinc) = 1.5 t = 1.5 * 10 ^ 3 kg; t2 (final zinc temperature) = 60 ºС, t1 (initial zinc temperature) = 0 ºС.

Calculation: Q = 400 * 1.5 * 10 ^ 3 * (60 – 0) = 36 * 10 ^ 6 J = 36 MJ.

2) Heat during combustion of gasoline: Q = q * m, where q (specific heat of combustion of gasoline) = 46 * 10 ^ 6 J / kg, m (mass of gasoline) = 2.5 kg.

Calculation: Q = 46 * 10 ^ 6 * 2.5 = 115 * 10 ^ 6 J = 115 MJ.