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A sample of gas in a cylinder is compressed by a piston at a constant pressure of 0.800 atm. ?
A sample of gas in a cylinder is compressed by a piston at a constant pressure of 0.800 atm. The volume of the cylinder decreases from 7.50 L to 3.00 L, while at the same time 340 J of energy leaves the gas by heat.
(a) What is the work done on the gas (in J)?(b) What is the change in its internal energy (in J)?
1 Answer
- jacob sLv 78 months agoFavorite Answer
Given Pressure (P) = 0.800 atm = 0.8 x 101325 Pascual
Volume V1 = 7.50L = 7.5 x 10^-3 m^3
V2 = 3.00L = 3.0 x 10^-3 m^3
dQ= -340J by convention negative sign
a) work done on the gas dw= pdv
w = p(V2-V1) => 0.8 x 101325x (-4.5 x 10^-3)
=> -364.77J
dq=dv + dw
dv= dq -dw
= -340 -(-364.77)= 24.70J
dv= 24.70J
This shows internal energy increase .
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