The mole fraction of ethylene glycol (C₂H₆O₂) in a solution containing 20% of C₂H₆O₂ by mass is-

1. 0.932

2. 0.0672

3. 0.832

4. 0.732

The molarity of a solution containing 5 g of NaOH in 450 mL solution is-

1. 0.188 mol dm^–3

2. 0.478 mol dm^–3

3. 0.378 mol dm^–3

4. 0.278 mol dm^–3

The molality of 2.5 g of ethanoic acid (CH₃COOH) in 75 g of benzene is-

1. 0.656 mol kg^–1

2. 0.616 mol kg^–1

3. 0.556 mol kg^–1

4. 0.456 mol kg^–1

If N₂ gas is bubbled through water at 293 K, how many millimoles of N₂ gas would dissolve in 1 litre of water?
(Partial pressure of nitrogen = 0.987 bar, Henry’s law constant for N₂ at 293 K = 76.48 kbar).

1. 0.716 mmol

2. 0.616 mmol

3. 0.726 mmol

4. 0.516 mmol