Calculate the number of moles in $5.75 \, g$ of sodium (atomic mass of sodium $= 23$).

$A$ gas jar contains $1.7 \, g$ of ammonia gas. Calculate the following:
$(i)$ Molar mass of ammonia.
$(ii)$ How many moles of ammonia are present in the gas jar?
$(iii)$ How many molecules of ammonia are present in the sample?

Raunak took $5 \, mol$ of carbon atoms in a container and Krish also took $5 \, mol$ of sodium atoms in another container of the same weight. $(a)$ Whose container is heavier? $(b)$ Whose container has a greater number of atoms?

State whether the following statement is true or false:
$A$ mole of any gas always occupies $22.4$ litres of volume at $0^{\circ} C$ and $1$ atmospheric pressure,which is known as standard temperature and pressure $(STP)$.

Mention the name given to the number of $6.022 \times 10^{23}$ particles.

$A$ silver ornament of mass $m \, g$ is polished with gold equivalent to $1\%$ of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.