O 4/29/2016 10:55 PM A 86.3/100 O 4/22/2016 11:05 AM Gradebook Print Calculator

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O 4/29/2016 10:55 PM A 86.3/100 O 4/22/2016 11:05 AM Gradebook Print Calculator Periodic Table Question 26 of 28 Incorrect R Map Sapling earning A 0.565-mol sample of Xe(g) initially at 298 K and 1.00 atm is held at constant pressure while enough heat is applied to raise the temperature of the gas by 12.1 K. Calculate the amount of heat q required to bring about this temperature change, and find the corresponding total change in the internal energy AU of the gas Assume that the constant-pressure molar specific heat for Xe which consists of single atoms, is equal to 5R12, where Ris the ideal gas constant. Number Number 142.1 AU 142.1 Incorrect. The gas is being held at a constant pressure, so it will expand as its temperature rises. As it expands, it does work on the surrounding environment. Therefore, only a portion of the heat energy put into the gas increases the internal energy of the gas Previous & Give Up & View Solution Try Again Next Exit

Explanation / Answer

q=Heat supplied= n*cp*(delta T)

=0.565*2.5*8.314*12.1

q=142.09 J =142.1 J (rounded off to 1 digit after decimal)

Delta U= n*cv*(delta T) /as cp-cv =R so cv=1.5R/

=0.565*1.5*8.314*12.1

Delta U=85.25 J = 82.2 J (rounded off to 1 digit after decimal)

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