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A sample of \mathrm{18\ g}  of \mathrm{H_2O} is slowly heated from \mathrm{300\ K} to \mathrm{400\ K}. Calculate the change in entropy (in J/K) during heating

(Given : specific heat of water is  \mathrm{4200 \frac{J}{kg. K}})

Option: 1

7.81


Option: 2

21.75


Option: 3

-7.81


Option: 4

36.25


Answers (1)

best_answer

As we learnt,

\mathrm{\Delta S=m\times C_P\times In\frac{T_{2}}{T_{1}}}

\Rightarrow \mathrm{\Delta S=\frac{18}{1000}\times 4200\times In\; \frac{400}{300}}

\Rightarrow \mathrm{\Delta S=21.75\; J/K}

 

Posted by

Divya Prakash Singh

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