Question

solve... please
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Answer 1

Explanation:

avg pressure=1 atm =1.013*10^5 N/m^2

heat q will be negative since it is rejected by the system

∆ V = 250 - 750 = -500 cm^3

work done(W) = avg pressure*∆v

= (1.013*10^5)*(-500) *10^-6

W= -50.65 J (negative since work done on system)

as per 1st law of thermodynamics

q = ∆u + w

where ∆u is change in internal energy

∆u = q-w = -20 - (-50.65) = + 30.65 J

Answer 2

Answer:

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