ed Molar freezing point depression constants of three solvents are as follows: K

Question

ed Molar freezing point depression constants of three solvents are as follows: Kf, water = 1.86 °C/m Kf, ethanol-1.99 °C/m K: acetic acid = 3.9 °C/m If 3 g of NaCI are dissolved in 30 g of each solvent, which solution has the largest depression in freezing point? in (A) acetic acid (C) water (B) ethanol (D) they are the same 31. When the vapor pressure of a liquid in an open container equals the atmospheric pressure, the liquid will (A) freeze (C) melt B) boil O1 (D) crystallize 32. When determining the calorimeter constant for a Styrofoam cup calorimeter, a student did not pour all the weighted hot water into the cool water. How will this affect the value of the calorimeter constant? (A) overstated (B) understated (D) does not apply (C) no change 3. Under the same conditions of temperature d ncr a liguid differs from a gas

Explanation / Answer

Q30

dTf = Kf*m

therefore, if molality is the same, then Kf must be the important factor

the largest Kf --> Lardest drop in Tf

Kf is larges for --> acetic acid

then

choose A

Q31

if Pliquid = Patm

this must vaporize

i.e. boil

Q32

the calorimeter will change less temperature, therefore, it has a higher (/incorreclty) calcualted vlaue

it is overstated

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