Question

Elevation of boiling point is inversely proportional to ______.

Options

• molal elevation constant (K_b)

• molality (m)

• molar mass of solute (M)

• weight of solute (W)

Answer 1

Elevation of boiling point is inversely proportional to molar mass of solute (M).

Explanation:

Boiling Point Elevation

Molality `m = x/W xx 1000`    ...(i)

Where, Molality = m 

Number of mole of solute = x

Weight of solvent in grams = W    ...(ii)

Moles of solute = mass of solute/molar mass of solute    ...(iii)

From eq. (i), (ii), (iii), we derive that elevation of boiling point is inversely proportional to the molar mass of the solute.