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The molar heat capacity of water at constant pressure, C, is 75 $J K^{- 1} m o l^{- 1}$ . When 750 J of heat is supplied to 90g of water which is free to expand, the increase in temperature of water is :

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answer is 2.

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Detailed Solution

$\begin{array}{l} Δ H = N C_{p} Δ T \\ 750 = \frac{90}{18} \times 75 \times Δ T \\ Δ T = \frac{10}{5} = 2 \end{array}$

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