Question

Q8)When a gas is compressed the work obtained is 360J while the heat transferred is 190J. Hence the change in internal energy is:-
-170J
-550J
170J
550J​

Answer 1

Explanation:

A system's internal energy decreases by 150 joules so that means <i>ΔU</i> is negative 150 joules— the negative representing a decrease in internal energy. The work done by the system or the work done on the environment is 30.0 joules and that's positive.

Answer 2

Answer:

(A)The change in internal energy of the system is -170J

Explanation:

Given that,when a gas is compressed the work obtained is 360J while the heat transferred is 190J.We are required to find the change in internal energy.

According to first law of thermodynamics,the Change in internal energy of a system is the difference of change in heat and work done.Therefore,we write

$dU=dQ-dW$

For compression,the work done is positive and hence $dW=360J$

Given that the heat transferred is $dQ=190J$

Substituting these values in the equation of 1st law,we get

$dU=190-360=-170J$

Therefore,the change in internal energy of the system is -170J

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