Termodinâmica

1 An ideal gas has a temperatureindependent molar specific heat cv at constant volume Let y CpCv denote the ratio of its specific heats The gas isothermally insulated and is allowed to expand quasistatically from an initial volume Vi at temperature Ti to a final volume Vf a Use the relation pVy constant to find the final temperature Tf of this gas b Use the fact that the entropy remains constant in this process to find the final temperature Tf 2 The molar specific heat at constant volume of a monatomic ideal gas is known to be 32 R Suppose that one mole of such a gas is subjected to a cyclic quasistatic process which appears as a circle on the diagram of pressure p versus volume V shown in the figure Find the following quantities a The net work in joules done by the gas in one cycle b The internal energy difference in joules of the gas between state C and state A c The heat absorbed in joules by the gas in going from A to C via the path ABC of the cycle 3 An ideal diatomic gas has a molar internal energy equal to E 52 RT which depends only on its absolute temperature T A mole of this gas is taken quasistatically first from state A to state B and then from state B to state C along the straight line paths shown in the diagram of pressure p versus volume V a What is the molar heat capacity at constant volume of this gas b What is the work done by the gas in the process ABC c What is the heat absorbed by the gas in this process d What is its change of entropy in this process