Calculate the amount of heat absorbed by 200 g of paraffin wax to melt completely at its melting point. [Specific latent heat of fusion of paraffin wax = 146 Jg⁻¹]

Given: mass of paraffin wax m = 200 g, melting at its melting point

specific latent heat of fusion L = 146 J g⁻¹

Melting happens at constant temperature, so only the latent heat term applies: Q = m L = 200 × 146 = 29 200 J

Heat absorbed = 29 200 J (29.2 kJ)

"To melt completely AT its melting point" tells you the temperature does not change at all, so Q = mL and nothing else. No specific heat capacity is given, which is another clue that no mcΔθ term is wanted.

Latent heat of FUSION is for melting or freezing; latent heat of VAPORISATION is for boiling or condensing. The question names fusion, so this is the solid-to-liquid change.