Question

find out number of atoms in 5 gram of K2 cr2 O7​

Answer 1

Explanation:

We know that,

No. of atoms/molecules= Mass/Molecular Mass x Avogadro no.

no. of atoms= 5/294 x 6.022 x 10²³(calculate mass of K2Cr2O7)

no. of atoms= 3.31x 10²4 atoms

hope u got it!!!