Please show work or explain. 1. When a nonvolatile solute is dissolved in a liqu
ID: 882070 • Letter: P
Question
Please show work or explain.
1. When a nonvolatile solute is dissolved in a liquid, the vapor pressure exerted by the liquid decreases. T/F
2. A sample of hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in atmospheres? (1 atm = 1.01325 ´105 Pa = 760 torr)
0.206 atm d. 21.2 atm
0.637 atm e. 1.59 x 104 atm
1.57 atm
3. Which compound is the most soluble in water?
a. CH3CH2CH2CH2CH2OH
b. CH3CH2CH2CH2OH
c. CH3CH2CH2CH2CH2CH2CH2OH
d. CH3CH2CH2OH
4. Dissolving a solute such as KOH in a solvent such as water results in
a. an increase in the melting point of the liquid.
b. an increase in the boiling point of the liquid.
c. an increase in the vapor pressure of the liquid.
d. no change in the boiling point of the liquid.
e. no change, KOH is insoluble.
5.The most probable state is the one with the _______.
A. highest energy
B. largest number of possible arrangements
C. lowest number of possible arrangements
D. most symmetry
E. highest enthalpy
6. Which of the following statements about H2SO4 is true.
A. It’s is a weak acid
B. It’s monoprotic
C. Ka1>Ka2
D. It’s a strong base
E. None of the above
Explanation / Answer
1) True. as solute increases vapour pressure will decrease because some of the surface will occupied by non volatile solute, so less number of solvent evapourate resulting decrease in vapour pressure of liquid.
2) 0.637 atm (760 torr= 1 atm)
3) d. CH3CH2CH2OH less non polar part more hydrogen bonding
4) b. an increase in the boiling point of the liquid.
as solute increases vapour pressure will decrease because some of the surface will occupied by non volatile solute, so less number of solvent evapourate resulting decrease in vapour pressure of liquid. and increasing in boiling point.
5) B. largest number of possible arrangements
6) C. Ka1>Ka2 in di or poly basic acids first ionisation constant is more than second . then second is greater than third.