What is the mass of 5 moles of chlorine gas. [Atomic mass of $\mathrm{Cl}$ =35.5u]

Ravi prepared a solution of sodium chloride by mixing 5.85 g of salt in 1 litre of water. Find:

a) Molar mass of sodium chloride.

b) Number of moles of sodium chloride dissolved. [Atomic masses of sodium and chlorine are 23 u and 35.5 u respectively].

c) Concentration of the sodium chloride solution.

Give reason for the following:

Ions are more stable than atoms.

Give reason for the following:

Noble gases have low reactivity.

Give reason for the following:

An atom is electrically neutral.

Identify the kind of motion in the following cases:

(i) A car moving with constant speed turning around a curve.

(ii) An electron orbiting around nucleus.