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Answer:
Since 3.18 moles is the quantity of 12 H atoms
X moles will be quantity of 4 0xygen atoms
Using rules of proportion
3.18*4=x*12
X=1.06 moles
Note that when question states
Eg 2moles of AgNO3
It means
2moles of Ag
2 moles of N
2 moles of 03
The last statement means
2 moles of three O bonded together
So in effect
2*3 moles of O
Hence above solution
Second answer
Find out moles as moles are universally constant
8g of H2 means 4moles
64 g of SO2 means 1 mole
44 g of CO2 means 1mole
48 g of O3 means 1 mole
Comparing moles H2 has highest molecules
As 1 mole of any compound means
It has 6.023*10^23 molecules
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