Question

नंबर ऑफ़ ऑक्सीजन एटम्स इन 0.3 मॉल ऑफ na2 ca3 डॉट 10एनएच 2​

Answer 1

1 mole of Na 2CO3.10HO contains 13 atoms of oxygen.

0.20 mole will contain 0.20×13=2.26

Hence, no of oxygen atoms = 2.26×N A

=15.66×10²³

is the answer.