6. A solute added to a solvent raises the boiling point of the solution because

Question

6. A solute added to a solvent raises the boiling point of the solution because a) the temperature to cause boiling must be great enough to boil not only the solvent but b) the solute particles lower the solvent's vapor pressure thus requiring a higher c) the solute particles raise the solvent's vapor d) the solute increases the volume of the solution, and an increase in volume requires ar e) two of the above are correct also the solute temperature to cause boiling temperature to cause boiling increase in the temperature to reach the boiling point (derived from PV-nRT) pressure thus requiring a higher 7. The osmotic pressure of a 100 mL aqueous solution containing 0.705 g of a solute is 1.05 mm Hg at 25°C, what is the molecular weight of the solute? 8. Initial rate data have been determined at a certain temperature for the gaseous reaction 2NO + 2H2 N2 + 2H2O [NOjo [H2]o Initial rate (M/s) 0.10 0.10 0.20 0.20 0.30 0.20 0.0150 0.0225 0.0600 The numerical value of the rate constant is: a) 7.5 b) 3.0 x 10 c) 380 d) 0.75 e) 3.0x 10 At a particular temperature, N20s decomposes according to a first order rate law with a half-life of 3.0 s. If the initial concentration of N2Os is 1.0x 1016 molecules/cm3, what will be the concentration in molecules/cm3 after 10.0 s? 9. 10. Chlorine atoms created by flash photolysis of Cl2 are observed to recombine according to a second- order rate law. The first half-life is 10 ms. How long will it take for the Cl atoms to decay to 1/8 of their initial concentration? a) 20 ms b) 30 ms c 40 ms d) 70 ms e) 80 ms 11. The rate constant of a reaction increases from 10.0 s to 100 s1 when the temperature is increased from 300 K to 400 K. What is the activation energy for the reaction in kJ/mol? a) 23.0 b) 12.7 c) 5.00d) 18.3e) 45.6

Explanation / Answer

Ans 6

Option B is the correct answer

Boiling occurs when

vapor pressure = atmospheric pressure.

When solute is added to the solvent, the vapor pressure decreases, therefore the boiling point of solution increases

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