Question

When a gas is heated, it absorbs 174 joules of heat from the surroundings. At the same time, the gas expands, doing pressure-volume work (P · V work) on the surroundings that is equal to 312 joules. (a) Determine whether the amounts of heat (q) and work (w) exchanged should have positive or negative signs. heat (q)

Answer 1

Answer:

Heat is absorbed by the system then the sign of Q is positive.

The system does work on the surroundings, then the sign of W is negative.

Explanation:

Given that,

Absorbs heat = 174 J

Surrounding energy = 312 J

We need to calculate the heat

Using thermodynamics first law

$\delta E=Q-W$

Where,$\Delta E$= Change in internal energy

Q = heat change of the system

W = work

According to thermodynamics first law,

Heat is absorbed by the system then the sign of Q is positive.

The system does work on the surroundings, then the sign of W is negative.

Hence, This is the required solution.