Question

8. One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be

(a) 80°C (b) more than 50°C but less than 80°C (c) 20°C (d) between 30°C and 50°C



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Answer 1

Answer:

The answer for this question is option a which is 80°

Answer 2

Answer:

let final temp = t

heat gain = heat lost

m c(t-30)= m c (50 - t)

t-30=50-t

2t=80

t=40. alternate in short average temp= (30+50)/2=40 deg c since same liquid have same mass.

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