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Question

If water of mass 20 g at 0oC is mixed with 40 g of water at 10oC, then the final temperature of the mixture is 10oC

A
True
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B
False
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Solution

The correct option is B False
qlost=qgain
Let the final temperature be x
q=mCPt20×103×(x0)×4.814=40×103×(10x)×4.81420(x)=40(10x)20x=40040x60x=400x=6.667
So, the final temperature is 6.667 not 10

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