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(Thermodynamics)

1. For each system below, calculate the value for ∆E. Show equation and work!

A) A system does kJ of work and gives off 220 kJ of heat.

B) A system does 50 kJ of work and absorbs 65 kJ of heat.

C) A system has 120 kJ of work done on it and gives off 50 kJ of heat.​

Respuesta :

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Answer:

A) -270 kJ; B) +15 kJ; C) + 70 kJ

Step-by-step explanation:

ΔE = q + w

By convention, anything leaving the system is negative and anything entering the system is positive.

A) ΔE = -220 kJ -  50 kJ = -270 kJ

B) ΔE =  +65 kJ -   50 kJ =   +15 kJ

C) ΔE =  -50 kJ + 120 kJ =  +70 kJ

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