Question

A bucket containing 8kg of water at 25c.2kg of water at 80c poured into it. Neglecting the heat energy absorbed by bucket, calculate the final temperature of water

Answer 1

By the principle of calorimetry,
Heat gained by cold water = Heat lost by hot water
Let the final temperatures be x
8*4200*(x - 25) = 2*4200*(80 - x)
or, 8x - 200 = 160 - 2x
or, 10x = 360
or, x = 36
Final temperature of the mixture = 36 degC