estion 1 (5 purposes) 17.1 g of calcium chloride is dissolved in 750, mL of a soak (d = 1.00 g/mL) and is placed in the congelater at -2 °C overnight. Which announcement best describes what would bechance to the disconnection? O a The freezing purpose of the calcium chloride disconnection would be -1.15 C, so the disconnection would congelate. h The freezing purpose of the calcium chloride disconnection would be b) -0.382°C, so the disconnection would congelate. e) The freezing coint of the calcum chloride disconnection would be 1.15 c, so the disconnection would congelate Save 9/6/2017
1)
Molar heap of CaCl2,
MM = 1*MM(Ca) + 2*MM(Cl)
= 1*40.08 + 2*35.45
= 110.98 g/mol
mass(CaCl2)= 17.1 g
compute of mol of CaCl2,
n = heap of CaCl2/molar heap of CaCl2
=(17.1 g)/(110.98 g/mol)
= 0.1541 mol
m(solvent)= 750 g
= 0.75 Kg
Molality,
m = compute of mol / heap of solvent in Kg
=(0.1541 mol)/(0.75 Kg)
= 0.2054 molal
i restraint CaCl2 is 3
use:
Δ Tf = i*Kf*mb
Δ Tf = 3.0*1.86 oC/m * 0.2054 m
Δ Tf = 1.15 oC
So, freezing purpose is -1.15 oC
Since sky is less than -1.15 oC, it allure congelate
Answer: a
I am recognized to acceptance singly 1 interrogation at a time