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2015-11-01T20:33:13+05:30

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Molecular weight or mass of  NinHydrin =  9 * 12 + 6 * 1 + 16 * 4
  = 178

As per Avogadro's law we have that one mole ( 178 gms) of NonHydrin contains N = avogadro number ie., 6.023 * 10²³ molecules.

so number of molecules in 7.4 gms are:  6.023 * 10²³ * 7.4 / 178
       = 2.502 * 10²²

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