Suppose you are required to determine the molecular mass of a protein molecule. Which colligative property is suitable for this purpose? Write the necessary equation for the determination of molecular mass.

Define the term 'osmosis' and 'osmotic pressure'. What is the advantage of using osmotic pressure as compared to other colligative properties for the determination of molar masses of solute in solution.

How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.

An organic compound contains 69.77% carbon, 11.63% hydrogen and the rest is oxygen. The molecular mass of the compound is 86u. The compound does not reduce Tollens reagent but reacts with Brady's reagent to give yellow precipitate. On vigorous oxidation the molecule produces ethanoic acid and propanoic acid. The compound also shows iodoform test. Identify and name the compound and write the reactions.

An organic compound has the molecular formula C_5H_(10)O . The compound does not reduce Tollen's reagent but reacts with Brady's re-agent to give orange precipitate. On vigorous Oxidation, the molecule produces ethanoic acid and propanoic acid. The com-pound also gives iodoform test. Identify the compound and write equations for chemical reactions involved.

Determine the Empirical formulae of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass.

A sample of drinking water was found to be severely contaminated with chloroform (CHCl_3) supposed to be carinogen.The level of contamination was 15 ppm (by mass) Determine the molality of chloroform in the water sample.