How much water can you heat from 50 ° to 80 ° if you burn 100 g of gasoline?

To determine the mass of water heated after burning gasoline, we use the equality: qb * mb = Sv * mw * (tk – tn) and mw = qb * mb / (Sv * (tk – tn)).

Constants and variables: qb – beats. heat of combustion of gasoline (qb = 4.6 * 107 J / kg); mb is the mass of burned gasoline (mb = 100 g = 0.1 kg); St. – beats. heat capacity of water (Sv = 4200 J / (kg * K)); tk – end. pace. (tк = 80 ºС); tн – temp. before heating (tн = 50 ºС).

Calculation: mw = qb * mb / (Sv * (tc – tn)) = 4.6 * 107 * 0.1 / (4200 * (80 – 50)) = 36.51 kg.