Question

If 30g of water at 90°C is mixed with 150g of water at 30°C. The resultant temperature i a) 60°C b) 20°C c) 40°C d) 0°C​

Answer 1

Answer:

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Let us assume that T>0°C

Heat lost by water=heat gained by ice to melt+heat gained by water formed from ice

⟹300×1×(50−T)=150×80×+150×1×(T−0)

⟹T=6.7°c

Hence our assumption that:

T>0°C is correct.

Answer 2

150g of water at 30°C

30g of water at 90°C , when it is poured into 150g of water, only 60°C temperature will be added because it is already coverd 30°C

so

resultant temperature = 90°C- 30°C = 60°C

option a) 60°C