Question

calculate the number of atoms of neon in 40g. (Ne=20u)​

Answer 1

Explanation:

Weight of Ne=40g

Molar mass of Ne = 20 u

Moles of Ne = Weight of Ne / Molar mass of Ne

= 40/20

=2 moles

Since,

1 mole of Ne contains 6.022*10^23 atoms

Hence,

2 moles contain =2*6.022*10^23 = 12.044*10^23 atoms

Answer 2

Answer:

1.2044*10^24 atoms

Explanation:

Molar mass of neon is 20 mol/g

given mass = 40 g

we know that,

given mass/molar mass= no. of moles

=40/20

=2 moles

Now, no. of atoms

=no. of moles* avagadro no.

=2*6.022*10^23 atoms

=12.044*10^23 atoms

=1.2044*10^24 atoms