Some Basic Concepts of Chemistry
A 1.24 M aqueous solution of KI has density of $$1.15 g / cm^{3}$$ . What is the percentage composition of solute in the solution?
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Single Choice
The mole fraction of solute in aqueous urea solution is $$0.2$$. The mass percent of solute is:
A$$45.45\%$$
Correct Answer
B$$43.34\%$$
C$$34.23\%$$
D$$35.67\%$$
Solution
The mole fraction of urea is $$0.2$$.
The mole fraction of water is $$1-0.2=0.8$$.
The molar masses of urea and water are $$60$$ g/mol and $$18$$ g/mol respectively.
Let us say one mole of the total solution is present.
The number of moles of urea and water present will be $$0.2$$ mol and $$0.8$$ mol. Their masses will be $$0.2 \times 60 = 12$$ g urea and $$0.8 \times 18=14.4$$ g water.
The mass percentage of solution $$= \dfrac {Mass\ of \ urea} {Total \ mass\ of\ solution} = \dfrac {12} {12+14.4} \times 100=45.45$$ %.
SIMILAR QUESTIONS
Some Basic Concepts of Chemistry
Cortisone is a molecular substance containing $$21$$ atoms of carbon per molecule. The mass percentage of carbon in cortisone is $$69.98\%$$. It's molar mass is:
Some Basic Concepts of Chemistry
A regular co-polymer of ethylene and vinyl chloride contains alternative monomers of each type. The mass percent of ethylene in this co-polymer is (as the nearest integer) :
Some Basic Concepts of Chemistry
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Some Basic Concepts of Chemistry
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Some Basic Concepts of Chemistry
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Some Basic Concepts of Chemistry
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Some Basic Concepts of Chemistry
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Some Basic Concepts of Chemistry
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Some Basic Concepts of Chemistry
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