1.5 g of a non-electrolyte solute dissolved in 75 g of benzene lowered

1.	1.5 g of a non-electrolyte solute dissolved in 75 g of benzene lowered the freezing point of benzene by 0.50 K Molal depression constant of benzene is 5.12 K kg mol-1 Molar mass of the solute (in g mol-) is 224.8 204.8 102.4 208.4
Answer» Answer: As ΔT F =K f ×m where, K f = Freezing POINT depression constant; ΔT f = Depression in freezing point; m= molality Now, ΔT f =K f × M 2 ×W 1 W 2 ×1000 where, W 2 = MASS of solute; W 1 = mass of BENZENE i.e. solvent; M 2 = MOLAR mass of solute ⇒0.40=5.12× M 2 ×50 1.0×1000 ⇒M 2 =256 Thus, the molar mass of non-electrolyte is

1.5 g of a non-electrolyte solute dissolved in 75 g of benzene lowered the freezing point of benzene by 0.50 K Molal depression constant of benzene is 5.12 K kg mol-1 Molar mass of the solute (in g mol-) is 224.8 204.8 102.4 208.4

Answer»

Answer:

As ΔT

×m

where,

= Freezing POINT depression constant;

ΔT

= Depression in freezing point;

m= molality

Now,

ΔT

×W

×1000

where,

= MASS of solute; W

= mass of BENZENE i.e. solvent; M

= MOLAR mass of solute

⇒0.40=5.12×

×50

1.0×1000

⇒M

=256

Thus, the molar mass of non-electrolyte is