A compound on analysis gave the following percentage composition. `Na =14.31% , S= 9.97% , H= 6.22% , O=69.5%`. The molecular mass of the substance is given as 322 Determine the molecular formula on the assumption that all the hydrogen atoms present in combination with oxygen as water of crystallisation : (AT. mass of Na =23 , H=1 , S=32, O=16)`

A 4% solution of sucrose (C_(12) H_(22) O_(11)) having mol mass 342 is isotonic with 3% solution of an unknown organic substance . Calculate the molecular mass of the unknown substance.

Define 'osmosis' and 'osmotic pressure'. Show that osmotic pressure is a colligative property. A 4% solution of sucrose (C_12 H_22 O_11) is isotonic with 3% solution of an unknown organic substance. Calculate the molecular mass of the unknown substance.

A compound 'A' having molecular formula C_(2)H_(5)O_(2)N , on reaction with Sn and conc. HCl gives a compound B which when treated with NaNO_(2) and dil. HCl gave compound C having molecular formula C_(2)H_(6)O . The compound C when treated with Na metal give effervescenes and when reacts with CrO_(3) give a saturated aldehyde having 2 carbon atoms. Determine the structures and names of A, B and C along with the sequence of reactions.

A 5% solution (by mass) of cane sugar in water has freezing point of 271 K. Calculate the freezing point of 5% solution (by mass) of glucose in water of the freezing point of pure water is 273.15 K. [Molecular masses glucose C_(6)H_(12)O_(6) = 180 amu, cane sugar C_(12)H_(22)O_(11)= 342 amu]