Freezing point of pore wax is 37 degree C what is the reasonable freezing point

Question

Freezing point of pore wax is 37 degree C what is the reasonable freezing point of wax and oil mixture? 37 degree C 30 degree C 73 degree C 40 degree C Which of the following solutes (same moles for all of them) has the greatest effect on the colligative properties for a given mass of a pure water 0.01 mol mgcl_2 0.01 mol NaNO_3 o.01 mol glucose All of them same 0.175 g of unknown(nonclectrolyte) compound is added to 19.82g of cooking oil ( kr=11.0 degree C/m) The change in the freezing point of the solution is 3.3degree C. What is the molalits of the solution? (delta T=k times sign m>i) 36.3 molality 3.33 molality 0.58 molality

Explanation / Answer

1)

since adding a solute in a solvent, normally decreases the freezing point, it must be below the normal freezing point (37)

then choose 30°C; avoid 40°C since we add solute to depress the freezing point

2)

greatest effect in colligative properties are those which will hav ea high "i" vant Hoff factor

these are the ones that will release the most ion

MgCl2 = Mg+2 and 2Cl- = 3 ions

glucose = i = 1

NANO# = Na+2 and NO3- = 2 ions

the most effective will be Mgcl2

3)

m = 0.175 g of nonelectrolye

m = 19.82 g of oil

K = 11

dF = -3.3°C

find molality of solution using

dT = Kmi

i = 1 since noneletrolyte

m = dT/K

m = 3.3/11 = 0.3 molal

answer is not shown

note that since K is too large, we will have a very low value of moallity

36.3 molal is extremly high

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