A gas is enclosed in a container fitted with a piston ofcross-sectional area 0.1

Question

A gas is enclosed in a container fitted with a piston ofcross-sectional area 0.150 m2. The pressure of the gasis maintained at 6600 Pa asthe piston moves inward 20.5 cm. (a) Calculate the work done by the gas.
J

(b) If the internal energy of the gas decreasesby 6.80 J, find the amountof heat removed from the system by heat during the compression.
J
I have part A. it's -202.95. I don't have part b. i got 196.15 as an answer. It's close but still isn'tright. Thanks for the help!! (a) Calculate the work done by the gas.
J

(b) If the internal energy of the gas decreasesby 6.80 J, find the amountof heat removed from the system by heat during the compression.
J
I have part A. it's -202.95. I don't have part b. i got 196.15 as an answer. It's close but still isn'tright. Thanks for the help!!

Explanation / Answer

Find change in volume, V = A*x = 0.150 * 0.205 =.03075 m3          Work done onthe gas, W = - P * V = - 6600 * .03075 = 202.95 J.         Use First Law ofThermodynamics     Q = U + W          = - 6.80 -202.95 = -209.75 J          Work done onthe gas, W = - P * V = - 6600 * .03075 = 202.95 J.         Use First Law ofThermodynamics     Q = U + W          = - 6.80 -202.95 = -209.75 J

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