Question

How much beat energy is required to melt 3.5kg of ice at 0°C? Specific latent heat of ice = 336|g and Specific heat capacity of ice = 2.1 x 10 Jkg-K-!.

pls give answer .... urgent!​

Answer 1

Answer:

Latent Heat: The heat required to convert a solid into a liquid or vapour (latent heat of fusion), or a liquid into a vapour(latent heat of evaporation), without change of temperature.

Sensible Heat: The heat required to change the temperature of a body without changing its phase.

So, basically as your question suggests, you need to evaluate the heat required to convert 2 kg of ice at 0 °C to water at 20 °C.. the total heat content will comprise of:

Total heat = Heat required to convert 2 kg of ice to 2 kg of water at 0 °C + Heat required to convert 2 kg of water at 0 °C to 2 kg of water at 20 °C.

Heat=mhfg+mCpΔT

Here, m ( mass of ice) = 2 kg

hfg (latent heat of fusion of ice) = 334 KJ

Cp of water (specific heat) = 4.187 KJ/Kg-K

ΔT(Temperature difference) = 20 °C

Therefore, Heat required = 2 x 334 + 2 x 4.187 x (20 - 0 )

Heat reqd= 835.48 KJ

Therefore, to melt 2 kg of ice 835.48 KJ of heat is required.