Question

calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetra chloride

Answer 1

if the solution is 30% by mass, then if you assume you have 100g of solution, how much is benzene, and how much is the CCl4?

Answer 2

benzene 30 g ccl4 -70g ???

Answer 3

so now, since you know grams of each, can you find moles of each?

Answer 4

c6h6 -.384 mol ccl4 - .454mol

Answer 5

since you know the moles of each, what is the mole fraction of benzene?

Answer 6

Mass of benzene = 30
molar mass of benzene = 78
moles of benzene = 30/78
= 0.38
mass of carbon tetrachloride = 70
molar mass of carbon tetrachloride = 154
moles of carbon tetrachloride = 70/154
= 0.45
total number of moles = 0.38 + 0.45 = 0.83
mole fraction of benzene = 0.38 / 0.83
= 0.45

Answer 7

http://www.meritnation.com/discuss/question/2416152

Answer 8

@JOYAL did u understand???