A solution weighing 'a' g has molality ' b '. The molecular mass of solute, if the mass of solute is ' c ' g, will be

Question

A solution weighing 'a' g has molality ' b '. The molecular mass of solute, if the mass of solute is ' c ' g, will be (A) (c/b) × (1000/(a-c)) (B) (b/a) × (1000/(a-b)) (C) (b/c) × (1000/(a-c)) (D) (c/a) × (1000/(b-a))

Tardigrade Admin · Accepted Answer

Molality, m=(wB/mB) × (1000/wA) b=(c/mB) × (1000/(a-c)); mB=(c/b) × (1000/(a-c))

Q. A solution weighing 'a' $g$ has molality ' $b$ '. The molecular mass of solute, if the mass of solute is ' $c$ ' $g$ , will be

$\frac{c}{b} \times \frac{1000}{( a - c )}$

$\frac{b}{a} \times \frac{1000}{( a - b )}$

$\frac{b}{c} \times \frac{1000}{( a - c )}$

$\frac{c}{a} \times \frac{1000}{( b - a )}$

Molality, $m = \frac{w _{B}}{m _{B}} \times \frac{1000}{w _{A}}$

$b = \frac{c}{m _{B}} \times \frac{1000}{( a - c )}$ ;

$m_{B} = \frac{c}{b} \times \frac{1000}{( a - c )}$

Q. A solution weighing 'a' g has molality ' b '. The molecular mass of solute, if the mass of solute is ' c ' g, will be

bc​×(a−c)1000​

ab​×(a−b)1000​

cb​×(a−c)1000​

ac​×(b−a)1000​