100g of a liquid A (molar mass 140 g/mol) and 100g of liquid B (molar mass 70 g/mol) form an ideal solution. What is the mole fraction of B in the vapor phase? (Assume mmHg and mmHg)
1/3
2/3
1/2
3/4
Related Questions
A solution is prepared by dissolving 10 g of glucose in 190 g of water. What is the mass percentage of glucose in the solution?
5%
10%
2%
95%
Which of the following properties of a substance is directly influenced by temperature?
Molarity of a solution
Molality of a solution
Rate of diffusion
Normality of a solution
A binary liquid mixture of components A and B exhibits an azeotrope at a specific composition. Which of the following statements is ALWAYS true about this azeotropic mixture?
The composition of the vapor phase is identical to the composition of the liquid phase.
The boiling point of the azeotrope is the average of the boiling points of pure A and B.
The azeotrope can be separated into pure A and B by fractional distillation.
The azeotrope always shows a positive deviation from Raoult's Law.
Which of the following is NOT a method for expressing the concentration of a solution?
Molarity
Molality
Mass percentage
Density
A 0.5 molal aqueous solution of urea () is prepared. What is the mole fraction of urea?
0.0089
0.0090
0.50
0.99
A mixture of two volatile liquids A and B shows a negative deviation from Raoult's law. Which of the following statements is INCORRECT regarding this mixture?
The enthalpy of mixing is negative.
The volume of mixing is negative.
The boiling point of the mixture is lower than that predicted by Raoult's law.
The intermolecular forces between A and B are stronger than the A-A and B-B interactions.
A solution is prepared by dissolving 0.5 moles of solute in 250 g of solvent. What is the molality of the solution?
2 m
0.5 m
1 m
4 m
What is the molarity of a solution containing 1 mole of solute in 500 mL of solution?
0.5 M
1 M
2 M
4 M
Which concentration term is independent of temperature?
Molarity
Molality
Normality
Formality
