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what is the no. of moles of O atom in 126 amu of HNO3? 1)2 2) 2/NA 3) 6 4) 6/NA
To find the number of moles we divide given mass of a substance by its atomic mass.Thus we have given 126 amu of HNO3 we can find its number of moles by dividing 126 by 63 (which is the moleculr mass of HNO3)=2 molesThus if 1 mole of HNO3 contains 3 moles of oxygen then its 2 moles contains 6 moles of oxygen.Hence option C is correct
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