number of atoms in 4 gram molecule of hydrogen
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No Of atoms in 1 molecule of H2 is avagadros No. 6*023* 10^²³ 2(1g)= 6.023* 10^²³ = 6.023*10²³/2= 3.012*10²³ now in 4 gm of H2 is 4(3.023*10²³)= 12.98*10²³
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