Identify the incorrect formula from the following options.

Number of moles of atoms= $\frac{M a s s i n g r a m}{G r a m a t o m i c m a s s}$

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Number of moles of molecules= $\frac{M a s s i n g r a m}{G r a m M o l e c u l a r M a s s}$

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Number of particles= $\frac{N u m b e r o f m o l e s}{A v o g a d r o n u m b e r}$

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Number of moles of gas at STP= $\frac{V o l u m e i n S T P}{22.4}$

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Solution

The correct option is C
Number of particles= $\frac{N u m b e r o f m o l e s}{A v o g a d r o n u m b e r}$

The correct formulae are:

Number of moles of atoms = $\frac{Mass in gram}{Gram atomic mass}$

Number of moles of molecules = $\frac{Mass in gram}{Gram molecular mass}$

Number of particles = $Number of moles \times Avogadro number$

Number of moles of gas at STP = $\frac{Volume at STP (litre)}{22.4 L}$

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