Q33 of 55 Page 5

Volume of a solution changes with change in temperature, then, will the molality of the solution be affected by temperature? Give reason for your answer.

Molality of a solution is defined as the number of moles of solute in 1 kilogram of solution.


Since molality depends on mass and not the volume of the solution, the mass is unaffected by temperature and molality of the solution is not affected by temperature.


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31

Hydrogen gas is prepared in the laboratory by reacting dilute HCl with granulated zinc. Following reaction takes place.

Zn + 2HCl → ZnCl2 + H2


Calculate the volume of hydrogen gas liberated at STP when 32.65 g of zinc reacts with HCl. 1 mol of a gas occupies 22.7 L volume at STP; atomic mass of Zn = 65.3 u.


 32

The density of 3 molal solution of NaOH is 1.110 g mL–1. Calculate the molarity of the solution.

 34

If 4 g of NaOH dissolves in 36 g of H2O, calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is 1g mL–1).

 35

The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then

(i) which is the limiting reagent?


B. calculate the amount of C formed?