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Ninhydrin having molecular formula C9H6O4,is commonly used by forensic scientists to detect and analyze fingerprints.The number of molecules in 7.4g of ninhydrin is......

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by sippi

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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

= 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