Calculate ΔE, if a system releases 66.3 kJof heat to its surroundings while the surroundings do...

Question

Question

Calculate ΔE, if a system releases 66.3 kJof heat to its surroundings while the surroundings do 43.0 kJ of work on the system.

Express your answer using two significant figures.

ΔEΔE =____________ kJ

Answer 1

Answer #1

By first law of thermodynamics

= q + w

Heat is released by the system hence q is negative.

So, q = - 66.3 KJ.

Work done onto the system , hence w is positive.

So, w = 43.0 KJ

Now, = (- 66.3 + 43.0) KJ = - 23.3 KJ.

Final answer is two significant figures is

= - 23 KJ.

Answer 2

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