Question

How many calories are required to raise the temperature of 225 g of water from 42°C to 75°C?

Answer 1

Approx. `30*kJ`.

Explanation:

The specific heat capacity of water is `4.12*J*K^-1*g^-1`. This value should have been quoted with the question.

We want the energy required for the transition of the given mass of water at `42` `""^@C` to water at `75` `""^@C`. `DeltaT` `=` `33` `""^@C` or `33` `K`.

Thus `225*cancelgxx4.12*J*cancel(K^-1)*cancel(g^-1)xx33*cancelK` `=` `??*kJ`