What mass of water can be heated from 20 C (degrees) to boiling, if it is given an energy equal to 200 kJ?

Given:

t1 = 20 ° C;

t2 = 100 ° C;

Q = 200 kJ (translated into SI) = 200,000 J;

To find:

m -?

Decision:

From the formula Q = c * m * (t2 – t1), where c is the specific heat capacity of the substance (for water 4200 J / (kg * ° C) we express the mass: m = Q / (c * (t2 – t1)) = 200000 / (4200 * (100 – 20)) = 0.6 kg = 600 g;

Answer: You can heat 600 grams of water.