Question

no.of oxygen atoms in 3Pb(NO3)2​

Answer 1

$\huge \underline\textbf{9}$

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Answer 2

Answer:

To calculate moles Pb(NO3)2 , divide the given mass by its molar mass (331.208 g/mol) . One mole of Pb(NO3)2 contains 6 moles of oxygen atoms. (2×3) . Calculate mol O atoms by multiplying the calculated mol Pb(NO3)2 by 6 mol O atoms