allery31% ethylene glycol (62 g/mol) by mass in water: mole fraction of glycol?
- 0.130
- 0.115
- 0.885
- 0.310
Show answer and solution
Correct answer: B. 0.115
In 100 g there are 31/62 = 0.5 mol glycol and 69/18 = 3.83 mol water, so x = 0.5/4.33 = 0.115.
NEET UG Solutions — practice questions — page 2
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31% ethylene glycol (62 g/mol) by mass in water: mole fraction of glycol?Read the answer and worked solution →How is the molarity of a solution defined?Read the answer and worked solution →Which of these concentration terms changes with temperature?Read the answer and worked solution →Find the molality of a solution of 6.0 g of urea (60 g/mol) dissolved in 250 g of water.Read the answer and worked solution →Naphthalene dissolves readily in which of these solvents?Read the answer and worked solution →No more solute dissolves at this temperature. What is the solution called?Read the answer and worked solution →If dissolving a solid in a nearly saturated solution is endothermic, raising temperature does what to solubility?Read the answer and worked solution →Why does pressure barely change the solubility of solids in liquids?Read the answer and worked solution →At constant temperature, Henry's law links the solubility of a gas in a liquid to which quantity?Read the answer and worked solution →At a given pressure, a gas with a larger Henry's law constant KH has what solubility?Read the answer and worked solution →Why do aquatic species prefer cold water to warm water?Read the answer and worked solution →Soda bottles are sealed under high pressure to do what?Read the answer and worked solution →The painful condition called bends in scuba divers is caused by bubbles of which gas in blood?Read the answer and worked solution →Weakness and confused thinking in climbers caused by low blood oxygen at high altitude is called what?Read the answer and worked solution →Gas solubility in a liquid falls as temperature rises because gas dissolution is what?Read the answer and worked solution →A gas has KH = 50 kbar in water. What mole fraction of it dissolves at a partial pressure of 1 bar?Read the answer and worked solution →A gas has KH = 100 kbar in water. About how many millimoles dissolve in 1 L of water (55.5 mol) at 1 bar partial pressure?Read the answer and worked solution →By Raoult's law, partial vapour pressure is proportional to which quantity?Read the answer and worked solution →For an ideal binary solution, how does total vapour pressure vary with the mole fraction of one component?Read the answer and worked solution →The vapour above an ideal mixture is richer in which component?Read the answer and worked solution →Pure A and B have vapour pressures 200 and 400 mm Hg. Ideal total at xB = 0.5?Read the answer and worked solution →Pure A: 300, pure B: 600 mm Hg; ideal liquid xB = 0.25. What is yB in the vapour?Read the answer and worked solution →Pure A: 450, B: 700 mm Hg. An ideal mix totals 600 mm Hg. What is xA?Read the answer and worked solution →Why does a non-volatile solute lower vapour pressure?Read the answer and worked solution →Adding 1.0 mol of sucrose to 1 kg of water lowers its vapour pressure about as much as adding which solute?Read the answer and worked solution →Which pair of liquids forms a nearly ideal solution?Read the answer and worked solution →Positive deviation means A-B forces, versus A-A and B-B, are what?Read the answer and worked solution →Why do ethanol and acetone show positive deviation?Read the answer and worked solution →Why does a chloroform and acetone mixture show negative deviation?Read the answer and worked solution →What is an azeotrope?Read the answer and worked solution →
Worked practice questions
How is the molarity of a solution defined?
- Moles of solute per kg of solution
- Moles of solute per litre of solution
- Moles of solvent per litre of solution
- Moles of solute per kg of solvent
Show answer and solution
Correct answer: B. Moles of solute per litre of solution
Molarity counts moles of solute dissolved in one litre of the whole solution.
Which of these concentration terms changes with temperature?
- Molarity (M)
- Molality (m)
- Mole fraction (x)
- Parts per million
Show answer and solution
Correct answer: A. Molarity (M)
Molarity is based on solution volume, and volume expands or contracts with temperature while mass does not.
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