Question: how much energy is needed to raise the temperature of 2.0 g of water 5.0 c?
Answer: In this case, the mass is 2.0g, the specific heat capacity of water is 4.18J/g/K, and the change in temperature is 5.0°C=5K , therefore the energy needed to raise it is: 5×2×4.18=41.8J .