Question

Calculate the molar mass of a substance if 1.25 moles of it weight 122.5 g
​

Answer 1

Given:-

→ Number of moles = 1.25

→ Weight of given no of moles = 122.5g

To find:-

→ Molar mass of the substance

Solution:-

We know that:-

No of moles = Given Mass/Molar mass

Thus:-

Molar mass = Given Mass/No of moles

=> Molar mass = 122.5/1.25

=> Molar mass = 98g

Thus, molar mass of the substance

is 98g.

Some Extra Information:-

No of moles :-

(i) Given Mass/Molar mass

(ii) No of particles/Avogadro number

No of atoms:-

No of moles × Avogadro Number

No of molecules:-

No of moles × Avogadro Number

Molar mass:-

Given Mass/No of moles