How much water, taken at a temperature of 100 ° C, can be evaporated by burning wood weighing 30 kg

How much water, taken at a temperature of 100 ° C, can be evaporated by burning wood weighing 30 kg and assuming that all the energy released during combustion is used to evaporate the water.

To calculate the mass of the evaporated water, we use the equality (we take into account that the taken water is at the temperature of the beginning of vaporization): L * mw = qd * md, whence mw = qd * md / L.

Values of variables and constants: qd – specific heat of combustion of wood (qd = 1 * 10 ^ 7 J / kg); md is the mass of burnt wood (md = 30 kg); L is the specific heat of vaporization of water (L = 2.3 * 10 ^ 6 J / kg).

Let’s make a calculation: mw = 1 * 10 ^ 7 * 30 / (2.3 * 10 ^ 6) = 130.4 kg.

Answer: You can evaporate 130.4 kg of water.