Question

calculate the number of atoms in p4.( given atomic mass of p= 31.0 u)​

Answer 1

Explanation:

Phosphorus molecule, P4

Atomic mass of phosphorus = 31 u

:. Molecular mass of P4 = 4 * 31 = 124 u

:. Molar mass of P4 is 124 u.

Given mass (m) of P4 molecule = 31 g

Avogadro 's number (N0) = 6.023 * 1023

Number (N) of particles (molecules) = Given mass/ Molar mass *Avogadro number

or N = m/ M *N0

= N = 31/124* 6.023* 1023

=> N = 1.5057 * 1023

hence,

Number of molecules = 1.5057 *1023