Question

How many atoms are present in 0.012 kg of C-12 ?

Answer 1

0.012 kg = 0.012*1000= 12 gm
molar mass of c-12 = 12 gm
it means we have 1 mole
so we have 6.022*10 ^23 atoms

Answer 2

$6.023\times 10^{23}$ atoms are present in 0.012 kg of C-12.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

$\text{Number of moles of carbon}=\frac{12g}{12g/mol}=1mole$

1 mole of C-12 contains = $6.023\times 10^{23}$ atoms of carbon

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