0.32 g of oxygen is kept in a rigid container and is heated .Find the heat energy needed to raise the temperature from `25^@C` to `35^@C`.The molar heat capacity of oxygen at constant volume is `20 J mol^(-1) K^(-1)`.

Calculate the number of kJ of heat neccesary to raise the temperature of 60.0g of aluminum from 35^(@) C to 55^(@)C . Molar heat capacity of Al is 24 J mol^(-1) k^(-1) .

The heat required to raise the temperature of a body by 1C degree is called

5 moles of oxygen are heated at constant volume from 10^@C ot 20^@C .What will be the change in the internal enregy of the gas?The molar specific heat of oxygen at constant pressure is C_p=7.03 cal mol^(-1) deg^-1 and R=8.36 Joule mol^(-1) "^oC^(-1) .

What is the activation energy for a reaction if its rate double when the temperature raised from 20^@C to 35^@C ? (R=8.314J//mol//K)

An oxygen cylinder of volume 30 litres has an initial gauge pressure of 15 atm and a temperature of 27 ^@C . After some oxygen is withdrawn from the cylinder, the gauge pressure drops to 11 atm and its temperature drops to 17 ^@C . Estimate the mass of oxygen taken out of the cylinder ( R= 8.31 J mol^-1 K^-1 ’, molecular mass of O_2 = 32 u)

What is the change in entropy when 2.5 mole of water is heated from 27^(@)C to 87^(@)C ? Assume that the heat capacity is constant (C_(p))_(m)(H_(2)O)=4.2J//gK, ln(1.2)=0.18)

x g sample of NH_(4)NO_(3) is decomposed in a Bomb calorimeter. The temperature of calorimeter increase by 4^(@)C . The heat capacity of the system is 1.25 " kJ"//.^(@)C . Calculate the value of x. Given molar heat of decomposition of NH_(4)NO_(3) at constant volume is 400 kJ " mol"^(-1) .

Calculate the heat of combustion of coal when 10 g of coal on burning raises the temperature of 2 litres of water from 20^@C to 55^@C .