Question

1 molal solution is one that contains one mole of solute in:

• A. 1000g of solvent
• B. 1L of solvent
• C. 1L of solution
• D. 22.4L of solution

Answer 1

The correct option is A

1000g of solvent

The explanation for the correct option.

(A) - 1000g of solvent

Molality (m): The number of moles of solute dissolved in 1000g (1 kg) of a solvent is known as the molality of the solution.

$\mathrm{Molality}=\frac{\mathrm{Number}\mathrm{of}\mathrm{mole}\mathrm{of}\mathrm{solute}}{\mathrm{Mass}\mathrm{of}\mathrm{solvent}\mathrm{in}\mathrm{gram}}\times 1000$

The explanation for incorrect options.

(B)- 1L of solvent

When 1 mole of a substance is present in 1 L of a solution is known as a normal solution.

(C) 1L of solution

A molar solution is defined as an aqueous solution that contains 1 mole (gram-molecular weight) of a compound dissolved in 1 litre of a solution.

(D)- 22.4L of solution

One of the most practical results of the Avogadro's is the molar volume of gases V_m which is 22.4 dm³/mol.

Hence, Option (A) is the correct option.