Q)
If 20 ml of ethanol (density = 0.7893 gm/ml) is mixed with 40 ml of water (density = 0.9971 gm/ml) at $25^{\large\circ}$C, the final solution has density of 0.9571 gm / ml. Calculate the percentage change in total volume of mixing. Also calculate the molality of alcohol in the final solution.
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