Question

80kg of water at 20• mixed with 5kg of water at 80•

Answer 1

Answer:

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Explanation:

Formulae:

heat=msΔt

m× latent heat = heat remained

Heat remained = Heat lost - Heat gained

=(5×1×20)−(2×0.5×20)

=100−20=80kcal

m×80=80

⇒m=1kg

Therefore final mass of water =5+1=6kg