The freezing point of a solution prepared by dissolving 150 × 10–3 g of caffeine in 10.0 g of camphor is lower by 3.07°c than that of pure camphor (kf = 39.7°c/m). what is the molar mass of caffeine?

Molar Mass=193.9738 g/mol

Molar Mass≅194g/mol

Explanation:

Consider the formula:

m=ΔT/K_{f}

where:

ΔT is freezing point depression

K_{f} is freezing point depression constant

m is the morality=(moles of solute/kg of solvent)

Now:

Now:

0.07733 (moles of solute/kg of solvent) *0.010 kg of solvent

moles of solute(Caffeine)

Molar mass = Mass of solute/moles of solute

Molar Mass=

Molar Mass=193.9738 g/mol

Molar Mass≅194g/mol

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explanation: