Question

800J of energy is required to change the state of 20kg of a substance from solid to liquid. What is the specific latent heat of fusion of the substance? Use the equation change in thermal energy= mass* specific latent heat

Answer 1

40 Joules/kg

Step-by-step explanation:

The formula linking the mass and latent heat to energy required to change the state of a substance is given by

ΔQ(Joules) = mass(kg) x Latent heat(joules/kg)

Given
ΔQ = 800J
mass = 20kg

Specific Latent heat = ΔQ/mass
= 800 Joules/20 kg

= 40 Joules/kg