Consider a solution of CO_{2(g)} dissolved in | vedclass

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(C) According to Henry's law,the partial pressure of a gas $(P_g)$ is directly proportional to its mole fraction $(X_g)$ in the solution: $P_g = K_H \

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(C) According to Henry's law,the partial pressure of a gas $(P_g)$ is directly proportional to its mole fraction $(X_g)$ in the solution: $P_g = K_H \cdot X_g$. Taking the logarithm on both sides: $log(P_g) = log(K_H \cdot X_g) = log(K_H) + log(X_g)$. This equation is of the form $y = mx + c$,where $y = log(P_g)$,$x = log(X_g)$,the slope $m = 1$,and the intercept $c = log(K_H)$. Since the slope is $1$ (positive) and there is a positive intercept $log(K_H)$,the plot is a straight line with a positive slope that does not pass through the origin. This corresponds to Plot $C$.

Consider a solution of $CO_{2(g)}$ dissolved in water in a closed container. Which one of the following plots correctly represents the variation of $log$ (partial pressure of $CO_2$ in vapour phase above water) [y-axis] with $log$ (mole fraction of $CO_2$ in water) [x-axis] at $25^{\circ}C$?

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