300 gram urea co(nh2)2 dilarutkan dalam 270 gram air. jika tekanan uap jenuh air pada suhu 800c = 700 mmhg. (ar h = 1, ar c = 12, ar n = 14, ar o = 16) a. tentukan fraksi mol larutan urea b. tentukan penurunan tekanan uap jenuh larutan. c. tentukan tekanan uap larutan.

Penjelasan:

dik : m urea = 300 g

m air = 270 g

Po = 700 mmHg

Dit :

a). X urea = ?

b). ΔP = ?

c). P larutan = ?

jb :

Mr urea = 60

Mr air = 18

– n urea :

n = m / mr

n = 300 g / 60 g/mol

n = 5 mol

– n air :

n = m / mr

n = 270 g / 18 g/mol

n = 15 mol

a). X urea = nt / nt + np

= 5 mol / 5 mol + 15 mol

= 5 mol / 20 mol

= 0.25

b). ΔP = Po * X urea

= 700 mmHg * 0.25

= 175 mmHg

c). ΔP = Po – Plarutan

Plarutan = Po – ΔP

= 700 mmHg – 175 mmHg

= 525 mmHg

semoga membantu….