Question

16.
i) How many grams of neon (Ne) will have the same number of atoms as 4g of calcium (Ca)?
(Atomic masses : Ne=20 u and Ca = 40 u)
i) Calculate the molar mass of S8​

Answer 1

Answer:

Mass of 1 atom of Ne = 20/6.022*10²³ g

Now,

Number of particles in 4 g of Ca,

= 4/40*6.022*10²³

= 6.022*10²² atoms

Therefore, number of atoms of Ne same as 4 g of Ca 

= 20*6.022*10²²/6.022*10²³

=20/10

=2 g

It is made up of 8 sulphur atoms. Atomic mass sulphur atom = 32 g. Molar mass of sulphur = 8 X 32 = 256 g.