Which one of the following is the correct way to calculate the number of moles of a substance?

\frac{W e i g h t o f s u b s t a n c e i n g r a m s}{G r a m m o l e c u l a r w e i g h t}

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\frac{N u m b e r o f m o l e c u l e s}{A v o g a d r o^{'} s N u m b e r}

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Number of moles is equal to the number of molecules.

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\frac{V o l u m e o f t h e s u b s t a n c e}{G r a m m o l e c u l a r w e i g h t}

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Solution

The correct options are
A $\frac{W e i g h t o f s u b s t a n c e i n g r a m s}{G r a m m o l e c u l a r w e i g h t}$ .
B $\frac{N u m b e r o f m o l e c u l e s}{A v o g a d r o^{'} s N u m b e r}$ .
Number of moles of a given substance can be calculated by two ways.

1. If the weight of the substance is given in gms, then by dividing this number with gram molecular weight of the substance will give the number of moles.

$\frac{W e i g h t o f s u b s t a n c e i n g r a m s}{G r a m m o l e c u l a r w e i g h t}$ .

2. If number of the total molecules present at given situation are known, then dividing it by Avogadro's number will give us number of moles.

$\frac{N u m b e r o f m o l e c u l e s}{A v o g a d r o^{'} s N u m b e r}$ .

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