The answer is 62.00 g/mol. Solution: Knowing that the freezing point of water is 0°C, temperature change Δt is Δt = 0C - (-1.23°C) = 1.23°C Since the van 't Hoff factor i is essentially 1 for non-electrolytes dissolved in water, we calculate for the number of moles x of the compound dissolved from the equation Δt = i Kf m 1.23°C = (1) (1.86°C kg mol-1) (x / 0.105 kg) x = 0.069435 mol Therefore, the molar mass of the solute is molar mass = 4.305g / 0.069435mol = 62.00 g/mol
The reaction between C2H6 and
Cl2 by addition is C2H4Cl2 or dichloroethane. It must be under the presence of
sunlight because halogen such as chlorine cannot easily react with the sigma
bond of alkane such as ethane.
