How do we calculate the moles of a substance and the number of particles?

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Solution

1. When the mass of the substance is given: Use this formula : Number of moles = $\frac{g i v e n m a s s}{a t o m i c m a s s}$
2. Calculation of the number of particles when the mass of the substance is given:
Number of particles = $\frac{(A v o g a d r o n u m b e r \times g i v e n m a s s)}{g r a m m o l e c u l a r m a s s}$
3. Calculation of mass when the number of particles of a substance is given:
Mass of a substance $= \frac{(g r a m m o l e c u l a r m a s s \times n u m b e r o f p a r t i c l e s)}{6.023 \times 10 p o w e r 23}$

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