A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10⁻¹² g. Calculate the number of carbon atoms in the signature.

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Solution

Mass of carbon in the signature = 10^-12 g
Number of moles of carbon atoms in the signature= $\frac{Mass of carbon}{Atomic mass of carbon} = \frac{10^{- 12}}{12}$
Number of carbon atoms in the signature = Number of moles $\times$ Avogadro's number
= $\frac{10^{- 12}}{12} \times 6.023 \times 10^{23} = 5.1 \times 10^{10} atoms$

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A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10−12 g. Calculate the number of carbon atoms in the signature.

Mass of carbon in the signature = 10-12 g Number of moles of carbon atoms in the signature= Mass of carbonAtomic mass of carbon = 10-1212 Number of carbon atoms in the signature = Number of moles × Avogadro's number = 10-1212×6.023×1023=5.1 × 1010 atoms

A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10⁻¹² g. Calculate the number of carbon atoms in the signature.