A) 458 J \[394\text{ }J\text{ }k{{g}^{-1}}{{K}^{-1}}\]
B) 1232 J \[394\text{ }J\text{ }k{{g}^{-1}}{{K}^{-1}}\]
C) 654 J \[394\text{ }J\text{ }k{{g}^{-1}}{{K}^{-1}}\]
D) 916 J \[394\text{ }J\text{ }k{{g}^{-1}}{{K}^{-1}}\]
Correct Answer: D
Solution :
| [d] Final temperature \[=\text{ }21.5{}^\circ C\] |
| Total heat gain = 0 |
| \[192\times 5\left( 21.5-100 \right)+\frac{128}{1000}\times 394\left( 21.5-8.4 \right)\] |
| \[+\text{ }240\times 4.2\text{ }\left( 21.5-8.4 \right)=0\] |
| \[-\,5\times 15072+13865.45=0\] |
| \[S=916\text{ }J\text{ }k{{g}^{-1}}\,{{K}^{-1}}\] |
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