Question

calculate change in entropywhen 5kg water at 30 degree Celsius is mixed with 15gm of water at 10 degree Celsius
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Answer 1

Heat water can release =10×1×40

=400cal

Heat required by ice to melt =800cal[80×10]

∵ heat release is less than heat required

So, water left = ice melts + log of water

=

80

400

+10g

=15gm