Question

Bantu saya tolong master

Answer 1

Verified answer

Wt = 270 gram (Mr = 180 gram/mol)
wp = 9 L = 9000 gram (Mr = 18 gram/mol)

a. P° = 30 mmHg
ΔP = .......................?

nt = wt/Mr = 270/180 = 1,5 mol
np = wp/Mr = 9000/18 = 500 mol
Xt = nt/(nt+np) = 1,5/(1,5+500) = 1,5/501,5 = 0,015
Xp = 1 - Xt = 1 - 0,015 = 0,985

ΔP = Xt.P°
= 0,015 x 30
= 0,45 mmHg

b. Kb = 1,86°C
ΔTb = ...................?

ΔTb = m.Kb
ΔTb = wt/Mr x 1000/wp x Kb
= 270/180 x 1000/9000 x 1,86
= 1,5 x 0,1 x 1,86
= 0,15 x 1,86
= 0,279°C

c. Kd = 0,52
ΔTd = ...................?

ΔTd = m.Kd
= 0,15 x 0,52
= 0,078°C