How much water can you get from 20 ° C to 100 ° C if you supply it with 840 MJ of energy?

To calculate the mass of water heated when transferring a given amount of thermal energy to it, we use the formula: Q = Sv * m * (t – t0), from where we express: m = Q / (Sv * (t – t0)).

Constants and variables: Q – reported thermal energy (Q = 840 MJ = 840 * 10 ^ 6 J); Sv – specific heat capacity of water (Sv = 4200 J / (kg * K)); t – final temperature (t = 100 ºС); t – temperature before energy transfer (t = 20 ºС).

Calculation: m = Q / (Sv * (t – t0)) = 840 * 10 ^ 6 / (4200 * (100 – 20)) = 2500 kg or 2.5 tons.