(e) Geothermal power stations pump water through heated rocks. The temperature of the water increases from 20 °C to its boiling point of 100°C
Calculate the change in thermal energy when the mass of water heated is 150 kg
Specific heat capacity = 4 200 J/kg °C

1 is the answer to this problem

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.