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NEET CHEMISTRYEasy

One mole of carbon atom weighs 12 g12 \text{ g}, the number of atoms in it is equal to: (Mass of carbon-12 is 1.9926×10−23 g1.9926 \times 10^{-23} \text{ g})

A

1.2×10231.2 \times 10^{23}

B

6.022×10226.022 \times 10^{22}

C

12×102212 \times 10^{22}

D

6.022×10236.022 \times 10^{23}

Step-by-Step Solution

To find the number of atoms in one mole of carbon, we divide the total mass of one mole of carbon by the mass of a single carbon-12 atom . Number of atoms =Mass of one moleMass of one atom= \frac{\text{Mass of one mole}}{\text{Mass of one atom}} Number of atoms =12 g1.992648×10−23 g≈6.022×1023= \frac{12 \text{ g}}{1.992648 \times 10^{-23} \text{ g}} \approx 6.022 \times 10^{23} atoms . This value is also known as Avogadro's constant (NAN_A) .

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