Question

An atom of neon has a mass of $3.35 \times {10^{ - 23}}g$. How many atoms of neon are there in $20g$ of the gas?

Answer 1

The Neon gas is inert/noble gas and its atomic number is $10$. atomic weight is about $20.179$, the melting point of neon gas is $248.67^\circ C\,(i.e,\, - 415.5^\circ F)$ and its boiling point is $- 246.048^\circ C\,(i.e,\, - 411^\circ F)$, neon gas is inert gas in periodic table situated in group $18$ and is most stable gas.

Complete step by step solution:
The unitary method application is a method for problem solving by first knowing the value of a single unit, and then finding the required value by multiplying the previously acquired single unit value with it. Basically, this method is used to find the value of a single unit from the value of a multiple, and so on to find the value of a multiple.
Neon is an inert or noble gas which is non reactive in nature and has a noble gas configuration of electrons distribution, neon gas generally emits orange light. Neon is an atom which has an atomic number of ten. Its atomic weight is perfectly $20.179$ which makes it to have ten neutrons and ten protons in its electronic configuration in its nucleus and ten electrons outside .
By Applying unitary method we get,
$3.35 \times {10^{ - 23}}g$ contains one atom of neon
Therefore, one gram of neon contains $\dfrac{1}{{3.35 \times {{10}^{ - 23}}g}}$
$20g$ of neon contains, $20 \times \dfrac{1}{{3.35 \times {{10}^{ - 23}}}}$

**So, $20g$ of neon contains $5.97 \times {10^{23}}$ atoms.

Note: **
Neon gas is a noble gas which is used in vacuum tubes, high-voltage indication devices, lightning arresters devices, wavemeter tubes, television tubes i.e, CRT, and in helium–neon lasers. Neon in a liquid form is commercially used as a cryogenic refrigerant in applications not requiring the cooling or low temperature range attainable with much extreme liquid-helium refrigeration.