Question

calculate the number of mass of 56 g. atomic mass ne=200

Answer 1

200u=10mole
​so 56u=10/200x56=2.8 moles

Answer 2

Given mass = 56 grams

Molar mass of Neon = 20 

No: of moles = $\frac{Given .mass}{Molar.mass}$
                      
                     = $\frac{56}{20}$
 
                     = 2.8 moles

To fin the no: of atoms  , we have a formula :

No: of atoms = No: of moles × Avogadro no:
             
                    = 2.8 × 6.022 × 10²³
                   
                    = 16.8616 × 10²³ atoms