Question

40 g of water at 100°C is mixed with 150 g of water and mixture temperature becomes 50°C. Find initial temperature
of cold water:
(A) 36.66°C
(B) 32°C
(C) 25°C
(D) 46.66°C​

Answer 1

Explanation:

50 gms water at 20 ⁰ C and 50 gms of water at 40⁰ C are mixed. Since the masses of the liquid at different temperatures are same, the answer is very easy and simple : average of 20⁰C and 40⁰C. that is: 30⁰C.

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