How much heat is needed to get steam at 100 degrees from 2 kg water taken at a temperature of 20 degrees?

univerkov | February 8, 2021 | education

To obtain steam from water, it is necessary to bring the water temperature to 100 ºС and completely convert the water into a gaseous state.

Q = Q1 + Q2.

Q1 (heating) = С * m * (tboil – tн); C – beats heat capacity (C = 4200 J / (kg * K)), m – water mass (m = 2 kg), tboil – temp. boiling point (tк = 100 ºС), tн – early. pace. (tн = 20 ºС).

Q2 (vaporization) = L * m; L – beats. heat of vaporization (L = 2.3 * 10 ^ 6 J / kg).

Q = 4200 * 2 * (100 – 20) + 2.3 * 10 ^ 6 * 2 = 672000 + 4600000 = 5272000 J = 5272 kJ.

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