A 75 gm block of copper taken from a furnace is dropped into a 300 gm glass beaker containing 200 gm of water. The temperature of water rises from `12^@C` to `27^@C` . Calculate the temperature of furnace.

The rate of reaction is doubled when the temperature changes from 27^@C to 37^@C . Calculate the energy of activation.

A refrigerator has to transfer an averageof 200 Joule ofheat per sec from temperature - 10^@C to +25^@C . Calculate the average power consumed assuming ideal reversible cycle and no other losses.

What do you mean by depression in freezing point of a solution ? How will you calculate the molecular mass of solute from depression in freezing point ? A solution containing 34.2 g cane sugar (C_12 H_22 O_11) dissolved in 500 g of water froze at - 0.374^@C . Calculate the freezing point depression constant of water.

The Initial and final temperature of water as recorded by an observer are (40.6+-0.2^@)c and (78.3+-0.3)^@c.. Calculate the rise of temperature with proper error limits.

One gm of water at 373 K is converted into steam at the same temperature. The volume of 1 c .c of water becomes' 1671 c.c on boiling. Calculate the change in internal energy of the system if heat of vaporisation of water is 5.4xx10^5calkg^-1 .

How much heat is required to raise the temperature of 240 gm of gold from 28^@C to 143^@C ? (Specific heat of gold = = 0.031 k cal//kg//^@C ).