Question

if r is the work done in the system and s is the heat and s is heat evolved by the system then
1. ∆E=r+s
2.∆E=r-s
3.∆E=r​

Answer 1

Answer:

∆E=r-s

Explanation:

bcoz heat is released so negative...

and work done on the system so +

Answer 2

Answer:

Concept:

The first law of thermodynamics.

Explanation:

According to the first law, the energy of an isolated system is conserved. An isolated system is one that does not exchange mass or energy with its surroundings. This equation depicts the two ways in which a closed system (one in which mass is conserved but energy is not) can exchange energy with its surroundings: through heat or through work.

ΔE = q + w

Because all energy transfers can be described as either heat flow or work done on or by a system, the total amount of heat energy that enters or exits (q) plus the total amount of work energy that enters or exits (w) must equal the total internal energy change of the system (E).

Hence, ΔE = r + s

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