객관식
Pure water boils at 100ºC. What is the new boiling point of water after the addition of 13.12 g aluminum chloride, AlCl3, to 615 g water?
3308
views
1
rank
13. Solutions
Boiling Point Elevation
객관식
An ethylene glycol solution contains 25.2 g of ethylene glycol (C2H6O2) in 99.5 mL of water. Determine the change in boiling point. Assume a density of 1.00 g/mL for water.
A
18.4°C
B
9.22°C
C
2.08°C
D
0.572°C
검증된 단계별 안내1
Calculate the molar mass of ethylene glycol (C2H6O2) by adding the atomic masses of its constituent elements: carbon (C), hydrogen (H), and oxygen (O).
Determine the number of moles of ethylene glycol by dividing the mass of ethylene glycol (25.2 g) by its molar mass.
Calculate the mass of water in grams using the given volume (99.5 mL) and the density of water (1.00 g/mL).
Find the molality of the solution by dividing the moles of ethylene glycol by the mass of water in kilograms.
Use the boiling point elevation formula, ΔT_b = i * K_b * m, where i is the van't Hoff factor (1 for ethylene glycol), K_b is the ebullioscopic constant for water, and m is the molality, to calculate the change in boiling point.
관련 영상
관련 실천
