28) 10 gm HCl is dissolved in 250 mL of its aqueous solution. If density of the solution is 1.2 gm⁄mL, then molality of the solution would be:

29) CH₃COOH exists as a dimer in benzene. 1.2 gm of the acid was dissolved and the volume was made upto 1 L by benzene. What is the formality?

30) 1 molal aqueous solution of any solute will have mole fraction:

31) How many grams of S are required to produce 100 moles and 100 gm H₂SO₄ separately?

32) An alloy has Fe, Co and Mo equal to 71%, 12% and 17% respectively. How many cobalt atoms are there in a cylinder of radius 2.5 cm and length of 10 cm? The density of alloy is 8.2 gm⁄mL. (Atomic weight of Co = 58.9)