Chemistry: A system gains 687 kJ of heat, resulting in a change in internal energy of the system equal to 156 kJ. How much work is done? 1. Work was done by the system.2. Work was done on the system.

A. Combustion since it can’t be nuclear….?...

A system gains 687 kJ of heat, resulting in a

princessbreanna0

14.02.2022

w = -531 kJ

1. Work was done by the system.

Explanation:

Step 1: Given data

Heat gained by the system (q): 687 kJ (By convention, when the system absorbs heat, q > 0).Change in the internal energy of the system (ΔU°): 156 kJ

Step 2: Calculate the work done (w)

We will use the following expression.

ΔU° = q + w

w = ΔU° - q

w = 156 kJ - 687 kJ

w = -531 kJ

By convention, when w < 0, work is done by the system on the surroundings.

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