Question

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L.The change in internal energy ∆U of the gas in joules will be

a) -500J
b) -505J
c) +505J
d) 1136.25J​

Answer 1

Answer:

ANSWER−

Force is push or pull acting on a body which tends to change its state of rest or of motion.

It is denoted by "F".

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Additional information-

SI unit of force is Newton(N).

C.G.S (centimetre gram second) unit of force is dyne.

The direction in Which the body is pushed or pulled is called direction of the force.

Effects of force -

A force can change the direction of a moving object.

A force can change the shape and size of an object.

A force can change the speed of a moving object.

A force acting on a body can change its state of motion or rest.

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Answer 2

Answer:

The change in the internal energy is given by the following expression.

ΔU=q+W

Since container is well insulated, q=0.

Hence, ΔU=W=−PΔV

ΔU=W=−2.5atm×(4.50L−2.50L)

ΔU=W=−5.0Latm

Convert the unit to J

ΔU=W=−5.0Latm×

1Latm

101.33J

C)−505J