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Answer :

1) Atoms to molecule ratio

1 molecule of C11H12N2O2: 12 atoms of H

2) Converting molecules of C11H12N2O2 to atoms of H.

[tex]\text{atoms of H=2.89}\cdot10^{21}C_{11}H_{12}N_2O_2\cdot\frac{12\text{ atoms of H}}{1moleculeofC_{11}H_{12}N_2O_2}=3.468\cdot10^{21}atomsofH_{}[/tex]

There are 3.468*10^21 atoms of H.

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