Mohon bantuannya ya.. sembilan gram zat nonelektrolit dan 360 gram air di campur , ternyata tekanan uap jenuhnya 40 mmHg . jika tekanan uap jenuh air pada suhu yang sma adl 40,1 mmHg , maka tentukanlah Mr zat tersebut...
liliput01
Diket: zat X mx = 9 gram mair = 360 gram --> Mr air = 18 P = 40 mmHg Po = 40,1 mmHg Dit: Mrx....? P = Po . Xa Xa = P/Po Xa = 40/40,1 Xa = 0,997 , mol air = massa air/ Mr air = 360/18 = 20 , Xa = mol air/(mol air + molx) 0,997 = 20/(20 + molx) 0,997 (20 + mol x) = 20 19,94 + 0,997molx = 20 0,997molx = 20 - 19,94 mol x = 0,06/0,997 mol x = 0,06 mol , mol x = massa x/Mrx Mr x = massa x / mol x Mr x = 9/0,06 Mr x = 150. jadi Mr zat nonelektrolit itu adalh 150.
zat X
mx = 9 gram
mair = 360 gram --> Mr air = 18
P = 40 mmHg
Po = 40,1 mmHg
Dit: Mrx....?
P = Po . Xa
Xa = P/Po
Xa = 40/40,1
Xa = 0,997
,
mol air = massa air/ Mr air = 360/18 = 20
,
Xa = mol air/(mol air + molx)
0,997 = 20/(20 + molx)
0,997 (20 + mol x) = 20
19,94 + 0,997molx = 20
0,997molx = 20 - 19,94
mol x = 0,06/0,997
mol x = 0,06 mol
,
mol x = massa x/Mrx
Mr x = massa x / mol x
Mr x = 9/0,06
Mr x = 150.
jadi Mr zat nonelektrolit itu adalh 150.