Calculate the entropy change when 50 gm water changes the temperature from `0^@C to 40^@C`.

At 60^C dinitrogen tetroxide in 50% dissociated.Calculate the standard free energy change at this temperature under 1 atm pressure.

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

A steel tape 1m long is correctly calibrated for a temperature of 27.0 ^@C . The length of a steel rod measured by this tape is found to be 63.0 cm on a hot day when the temperature is 45.0 ^@C . What is the actual length of the steel rod on that day? What Is the length of the same steel rod on a day when the temperature is 27.0 ^@C ? Coefficient of linear expansion of steel = 1.20xx10^-5 K^-1 .

The rate of reaction triples when temperature change from 20^@C to 50^@C . Calculate the energy of activation. (R = 8.314 Jmol^-1K^-1)

The co-efficient of volumn expansion of a liquid is 49*10-5 C^-1 ,By what percentage does its density change on raising the temperature by 50°C?

Calculate the entropy change in surrounding when 1 mol of H_2O(l) is formed under standard condition at 298K. Given Delta_fH^@ =-286KJ mol^(-1)

A black body at 27°C surrounds another at -73°C.Calculate the net heat transferred per square metre of the body at higher temperature.

In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150^@C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 1-50 cm^3 of water at 27^@C . The final temperature is 40^@C . Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal?

A coil has an inductance of .2 henry. Calculate the value of induced emf when the current in the coil is changing at the rate of 150 ampere per sec.

A ‘thermacole’ icebox is a cheap and efficient method for storing small quantities of cooked food in summer in particular. A cubical icebox of side 30 cm has a thickness of 5.0 cm. if 4.0 kg of ice is put in the box, estimate the amount of-ice remaining after 6 h. The outside temperature is 45 ^@C , and co-efficient of thermal conductivity of thermacole is 0.01 J s^-1.m-^1 K-^1 . [Heat of fusion of water = 335 x 103 J kg^-1