Question

60gr urea mr : 60. 72gr air, mr : 18. tekanan uap pelarut 22,5mmhg. tekanan uap larutan?

Answer 1

Mol urea = massa / Mr = 60 / 60 = 1
mol air = massa / Mr = 72 / 18 = 4

X air = mol air / (mol air + mol urea)
X air = 4 / (4 + 1)
X air = 0,8

P = X air x P°
P = 0,8 x 22,5 = 18 mmHg