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A 60 percent by mass aqueous ammonia solution is given. What is the approximate mole fraction of ammonia?
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Answer and explanation
Correct answer: 0.61
Take 100 g of solution, containing 60 g ammonia and 40 g water. With molar masses 17 g mol⁻¹ for NH₃ and 18 g mol⁻¹ for H₂O, ammonia moles = 60/17 ≈ 3.53 and water moles = 40/18 ≈ 2.22. Total moles ≈ 5.75, so x(NH₃) = 3.53/5.75 ≈ 0.61. Option C is correct.
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What is the correct answer to this question?
0.61
Why is this the correct answer?
Take 100 g of solution, containing 60 g ammonia and 40 g water. With molar masses 17 g mol⁻¹ for NH₃ and 18 g mol⁻¹ for H₂O, ammonia moles = 60/17 ≈ 3.53 and water moles = 40/18 ≈ 2.22. Total moles ≈ 5.75, so x(NH₃) = 3.53/5.75 ≈ 0.61. Option C is correct.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Mole concept and molar mass.
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