SP9c Energy Calculations

Question 1

change in thermal energy (J) = ?

Answer 1

specific heat capacity (J/kg °C) x change in temp (°C)

Question 2

energy needed for a change in state (J) = ?

Answer 2

mass (kg) x specific latent heat (J/kg)

Question 3

Why is the specific latent heat of vaporisation generally greater then the specific latent heat of fusion?

Answer 3

because of the huge change in volume from change in a liquid to gas, compared to the change of a solid to a liquid.