Question

What will be the temperature of the mixture when one litre of water at 30 degree Celsius is mixed with one litre of water at 50 degree Celsius? [2 MARKS]

Answer 1

Concept : 1 Mark
Result : 1 Mark
Heat flows from a hotter object to a colder object until both the substances have equal heat. In the process, the hotter object becomes colder and the cooler object by absorbing this heat becomes hotter. Hence, the final temperature should be in between.

Q = m*s*$∆T$

Heat lost = Heat gained

Here mass and material are same, let final temperature is T, so

m*s*$∆T_1$ = m*s*$∆T_2$

(30−T)=(T−50)

2T=80

T=40 ⁰C

Mixture will have temperature 40 ⁰C