Question

a system absorbs 600J of heat and the system does work equivalent to 900J then the value of ∆E for the system is?​

Answer 1

Answer:

- 300J

Explanation:

q= +600J

W= -900J

∆E = q+w

= 600-900

=-300J

Answer 2

Given :

Heat absorbed by the system (Q) = +600 J

Work done by the system (W) = 900 J

To Find :

The internal energy of the system (ΔE)

Solution :

According to First law of Thermodynamics,

Change in internal energy (ΔE) = Heat (Q) + Work Done (W)

In this question, work is done by the system and hence W = - 900 J

∴ Change in internal energy (ΔE) = Q + W

                                                       = 600 + (-900)

                                                       = -300 J

Therefore, the internal energy of the system is found to be -300 J.