Question

You add 50 mL of water at 20C to 200 mL of water at 70C. What is the most likely final temperature of the mixture?
A. 60C
B. 50C
C. 30C
D. 45C

Answer 1

100*20 + 200*80 = 300* T
T = 60

Answer 2

Answer:

Option (a)

Explanation:

Let c be the specific heat of water.

According to the principle of caloriemetry.

Heat lost by hot water = heat gained by cold water

200 x c x (70 - T) = 50 x c x (T - 20)

280 - 4T = T - 20

300 = 5T

T = 60 C