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Chemistry Class 12 NCERT Solutions: Chapter 2 Solutions Part 1
Q: 1. Calculate the mass percentage of benzene and carbon tetrachloride dissolved in of carbon tetrachloride.
Ans:
Mass percentage of
Alternatively,
Mass percentage of
Q: 2. Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.
Ans:
Let the total mass of the solution be and the mass of benzene be .
β΄ Mass of carbon tetrachloride
Molar mass of benzene
β΄ Number of moles of
Molar mass of carbon tetrachloride
β΄ Number of moles of
Thus, the mole fraction of is given as:
Q: 3. Calculate the molarity of each of the following solutions:
(A) of solution
(B) Diluted to
Ans:
Molarity is given by:
(A) Molar mass of
Therefore, molarity
(B) Number of moles present in 1000 ml of 0.5 M
Therefore, molarity
Q: 4. Calculate the mass of urea required in making molal aqueous solution.
Ans:
Molar mass of urea
Molar aqueous solution of urea means:
of water contains of urea
of urea
That is,
of solution contains of urea
Therefore, of solution contains
(Approximately)
Hence, mass of urea required