If heat flows into a system and the system does work on the surroundings, what will be the signs on q and w? select the correct answer below o positive q, positive w o positive q, negative w o negative q, positive w o negative q, negative w

q = Positive

w = Negative

Explanation:

As per first law of thermodymanics,

ΔE = q + w

Where,

ΔE = Change in internal energy

q = Heat absorbed or heat released by the system

w = Work done

Sign conventions are used for heat transfer and work done during a thermodynamics process.

Sign convention for Heat transfer

Sign convention for Work done

In the given question, work is done on the surroundings so, w is negative.

Heat flows into a system or in other word heat is added to the system,

So q is positive.

your answer would be a. 12.5 kg

u i forgot the answer?