A system gains 777 kJ of heat, resulting in a change in internal energy of the...

Question

Question

A system gains 777 kJ of heat, resulting in a change in internal energy of the system equal to +151 kJ.

How much work is done?

w= ________ kJ

choose the correct statement

a) work was done by the system

b) work was done on the system

Answer 1

Answer #1

According to first law of thermodynamics

dU = q+W

where dU = internal energy = +151 Kj,

q= heat gained = +777 kj [positive for endothermic]

W = work done

151 KJ - 777 kj = w

work done = -626 KJ

negative work done indicate work is done by the system

******************************************************

Answer 2

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