While conducting a lab experiment, Ali calculated that 1.20 E6 Joules of heat were needed to melt 18.5 kilograms of an unknown substance at its melting point. What is the latent heat of fusion of the substance

Latent heat of fusion of the substance is

Explanation:

Latent heat of fusion denotes amount of energy (heat) per unit mass required to melt a solid material at constant temperature and pressure i.e. at it's melting point

Here amount of heat required =

Mass of unknown substance being melted = 18.5 kg

So, latent heat of fusion of the substance = (required heat energy to melt)/(mass of the unknown substance) =

So, latent heat of fusion of the substance is

the answer for sodium is 0.186

the answer for rubidium is 0.251