its heat of combustion is . × J/g ? . What amount of heat must be supplied to .
× – kg of nitrogen (at room temperature) to raise its temperature by ° C at constant pressure ? (Molecular mass of N = ; R = . J mol – K – .) . Explain why (a) Two bodies at different temperatures T and T if brought in thermal contact do not necessarily settle to the mean temperature ( T + T )/ .
(b) The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat. (c) Air pressure in a car tyre increases during driving. (d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude. .
A cylinder with a movable piston contains moles of hydrogen at standard temperature and pressure. The walls of the cylinder are made of a heat insulator, and the piston is insulated by having a pile of sand on it. By what factor does the pressure of the gas increase if the gas is compressed to half its original volume ? .
In changing the state of a gas adiabatically from an equilibrium state A to another equilibrium state B , an amount of work equal to . J is done on the system. If the gas is taken from state A to B via a process in which the net heat absorbed by the system is . cal, how much is the net work done by the system in the latter case ?
(Take cal = . J) . Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure.
B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following : (a) What is the final pressure of the gas in A and B ?
(b) What is the change in internal energy of the gas ? (c) What is the change in the temperature of the gas ? (d) Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface ? .
An electric heater supplies heat to a system at a rate of 100W. If system performs work at a rate of joules per second. At what rate is the internal energy increasing? .
A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Fig. ( . ) Fig. .
Its volume is then reduced to the original value from E to F by an isobaric process. Calculate the total work done by the gas from D to E to F