A x molal solution of compound in benzene has a mole fraction of solute equal to 0.2. The value of x is

Question

A x molal solution of compound in benzene has a mole fraction of solute equal to 0.2. The value of x is (A) 14 (B) 3.2 (C) 1.4 (D) 2

Tardigrade Admin · Accepted Answer

The given solution contains that x moles of solute in 1 kg of benzene ∴ Moles of benzene =(1000 g/78 g mol-1)=12.8 mol ∴ 0.2=(x/x+12.8); 5=1+(12.8/x) (12.8/x)=4 ; x=(12.8/4) =3.2

Q. A x molal solution of compound in benzene has a mole fraction of solute equal to 0.2. The value of x is

14

3.2

1.4

2

The given solution contains that $x$ moles of solute in $1 k g$ of benzene
$∴$ Moles of benzene $= \frac{1000 g}{78 g m o l ^{- 1}} = 12.8 m o l$
$∴ 0.2 = \frac{x}{x + 12.8}; 5 = 1 + \frac{12.8}{x}$
$\frac{12.8}{x} = 4; x = \frac{12.8}{4}$
$= 3.2$

Q. A x molal solution of compound in benzene has a mole fraction of solute equal to 0.2. The value of x is

14

3.2

1.4

2

The given solution contains that x moles of solute in 1kg of benzene ∴ Moles of benzene =78gmol−11000g​=12.8mol ∴0.2=x+12.8x​;5=1+x12.8​ x12.8​=4;x=412.8​ =3.2

The given solution contains that $x$ moles of solute in $1 k g$ of benzene
$∴$ Moles of benzene $= \frac{1000 g}{78 g m o l ^{- 1}} = 12.8 m o l$
$∴ 0.2 = \frac{x}{x + 12.8}; 5 = 1 + \frac{12.8}{x}$
$\frac{12.8}{x} = 4; x = \frac{12.8}{4}$
$= 3.2$