Question

calculate molar mass of a compound x if its 20g contains 3.011×10²³ molecules of compound x​

Answer 1

Given:-

→ Mass of compound 'x' = 20g

→ Number of molecules = 3.011×10²³

To find:-

→ Molar mass of compound 'x'.

Solution:-

• Avogadro Number = 6.022×10²³

Firstly, let's calculate the number of moles in 3.011×10²³ molecules of x.

No of moles :-

= No of molecules/Avogadro Number

= 3.011×10²³/6.022×10²³

= 3.011/6.022

= 0.5 mole

Now, we know that :-

Molar mass :-

= Given Mass/No of moles

=> Molar mass = 20/0.5

=> Molar mass = 40g/mol

Thus, molar mass of compound 'x'

is 40g/mol.

Some Extra Information:-

• No of moles = Given Mass/Molar mass

• Mass = No of moles × Molar mass

• No of moles :-

= No of atoms /Avogadro Number

• No of atoms/molecules :-

= No of moles × Avogadro Number