How much heat 50 gm of water at `25^@C` will take to reach boiling point?

600 g of water at 30^(@)C is kept in a vessel of water equivalent 60 g. If the vessel is supplied heat at the rate of "100 cal.s"^(-1) , how much time will the water take to reach its boiling point?

Earth gains energy from the sun at a rate of 8.4 J cdot cm^(-2) cdot "min"^(-1) . A black coloured calorimeter, having water equivalent of 15g, contains 100 g water at 25^(@)C . The calorimeter is kept at the focus of a convex lens facing the sun. If the aperture of the lens is 1000 cm^(2) , how much time will the water take to reach its boiling point?

How much heat to be supplied to raise the temperature of 100 g water from 20^(@)C to the normal boilling point of water ?

A solution contains 5.6 gm of glucose in 1000 gm of water. Calculate the boiling point of the solution. ( k_b for water = 0.52 K kg mol^-1 )

A solution containing 6 gm of a solute dissolved in 250 ml of water gave an osmotic pressure of 4.5 atmosphere at 27^(@)C . Calculate the boiling point of the solution. The molal elevation constant for water is 0.52

Water equivalent of an electric kettle is 100 g. 890 g of water is taken in it, and it is then switched on. If water needs 3 min 45 s to reach its boiling point from and initial temperature of 20^(@)C , find the rate of production of heat by the kettle? (Assume that 20% of the energy produced is wasted.)

How much is 8% of Rs. 25

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

How much heat is required for 40g water to boil and turn into vapour?