Choose the most appropriate answer for the following:

Which of the following would weigh the least?

A) 2 gram atoms of nitrogen.

B) 1 mole of silver

C) 22.4 Litres of oxygen gas at 1 atomspheric pressure and 273K

D) 6.02  x 10²³ atoms of carbon.

[ atomic masses : Ag (108, N =14, O=16, C=12]

(c) complete the following calculation. Show working for complete credit:

I) calculate the mass of calcium that will contain the same number of atom as are present in 3.2 gm of sulphur.

[atomic masses : S= 32, Ca= 40]

complete the following calculation. Show working for complete credit:

if 6 liters of hydrogen and 4 liters of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual.

Complete the following calculation. Show working for complete credit:

If the empirical formula of a compound is CH and it has a vapour density of 13 find the molecular formula of the compound.