Answers

2015-05-22T10:29:07+05:30
1mole of any substance contains 6.023×10²³ molecules
so 5 mole of H₂S₂0₈ contains 5×6.023×10²³ = 3 × 10²⁴ molecules 
now 1 molecule of H₂S₂0₈ contains 12 atoms 
so  3 × 10²⁴ molecules of H₂S₂0₈ contains 12×3 × 10²⁴ atoms = 36 ×10²⁴ atoms
so 5 mole of H₂S₂0₈ contains 36 ×10²⁴ atoms ..
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