Latent heat of vaporisation of water is 540 cal/gm.Explain the meaning of the statement.

The latent heat of viporisation of water is 2240J if the work done in the process of vaporisation of 1g is 168J the increase in internal energy is

Explain what is meant by latent heat.

Calculate the heat of combustion of coal, when 10 gm of coal, on burning raises the temperature of 2 kg of water from 20°C to 55°C

Explain the meaning of statement, "Adsorption is a surface phenomenon."

What do you mean by water of crystallisation? Explain giving examples.

An electric heater takes 15 min to raise a certain quantity of water from 0°C to its boiling point.If it takes another 80 min to turn all water into steam ,find the latent heat of vaporsation of water.

75 g of water at 100^@ C is added to 20 g of ice at -15^@C . Calculate the resulting temperature, give that latent heat of ice= 80 cal g^(-1)C^(-1) and specific heat of ice=0.5 cal g^(-1) C^(-1) .

When 0.15 kg of ice at 0^@C mixed with 0.30 kg of water at 50^@C in a container, the resutling temperature is 6.7^@C . Calculate the latent heat of fusion of ice. Given S_(water) = 4186J kg^-1 K^-1 .

200 gram of a solid ball at 20^@C is dropped in an equal amount of water at 80^@C . The resulting temperature is 60^@C . This means that specific heat of solid is-

A brass boiler has a base area of 0.15 m2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass = 109 J s ^-1m^- 1K^-1 , Heat of vaporisation of water = 2256 xx 10^3 J kg^-1 .