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Which of the following formulae are not correctly depicted?

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$Mass of one molecule of a substance = \frac{Gram molecular mass of the substance}{Avogadro' s number}$

$Molar mass = \frac{Mass of substance}{Moles of substance}$

$Number of molecules = \frac{Mass of the substance}{Molar mass} \times Avogadro' s no .$

Number of moles x Molar mass = Number of molecules

answer is D.

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Detailed Solution

Molar mass = mass per mole of the substance = $\frac{Mass of substance}{Moles of substance}$

Rewriting it as: Number of moles of a substance = $\frac{Mass of substance}{Molar mass}$

Also, number of moles of a substance × Molar mass = mass of the substance.

Number of molecules = Number of moles × Avogadro's constant = $\frac{Mass of substance}{Molar mass} \times Avogadro' s no .$

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