A mixture of NH4OH and water having a concentration of 5 mole per litre. If the density of the solution is 1.7g/ml then determine the molality, mole fraction and weight by weight percentage
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Correct option is C)
The mole fractions of ethanol and water are 0.25 and 0.75 respectively.
Let 1 mol of the mixture be present.
The moles of ethanol and water will be 0.25 and 0.75 respectively.
The molar masses of ethanol and water are 46 g/mol and 18 g/mol respectively.
The masses of ethanol and water are 0.25×46=11.5 g and 0.75×18=13.5 g respectively.
The percentage concentration of ethanol by weight of mixture is
11.5+13.5
11.5
×100=46 %.
Explanation:
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