A sample of gas in a cylinder is compressed by a piston at a constant pressure of 0.800 atm. ?

Question

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)?

(a) What is the work done on the gas (in J)?(b) What is the change in its internal energy (in J)?

jacob s · Accepted 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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A sample of gas in a cylinder is compressed by a piston at a constant pressure of 0.800 atm. ?

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