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2015-11-06T16:06:20+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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2015-11-06T16:32:16+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Chemical formula of Ninhydrin is C₉H₆O₄ 
Molar mass = 9×12 + 6×1 + 4×16 = 108+6+64 = 178g

178 gram of Ninhydrin contains = 1 mole = 6.022×10²³ molecules
1 gram of Ninhydrin contains = 6.022×10²³/178 molecules
7.4 gram of Ninhydrin contains = 7.4×6.022×10²³/178 = 2.561×10²² molecules

So number of molecules in 7.4 gram Ninhydrin is 2.561×10²² molecules.
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