JEE Main 2022 · 27 Jul · Shift 1 · Chemistry Q61

ChemistrySingle correct+4 / -1Question 61 of 90

250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to

(Given: Atomic Weights are, H, 1 u; C, 12 u; O, 16 u)

1.03

2.06

3.09

5.40

Answer and worked solution

Official answer: B

Carbon $0.108\times250=27$ g, i.e. $\frac{27}{72}=0.375$ mol glucose (67.5 g).

Water 182.5 g, so the molality is $\frac{0.375}{0.1825}\approx2.06$ mol kg $^{-1}$ .

(B)

Topics:Concentration terms Mole concept

JEE Main 2022 · 27 Jul · Shift 1, Chemistry question 61