The weight of 6.023 × 1023 atoms of carbon is A. 12 gms B. 120 gms C. 1.2 gms D. 0.12 gms

The correct answer is A. 12 gms.

One mole of any substance contains $6.02214076 \times 10^{23}$ atoms, molecules, or ions. This number is called the Avogadro constant, and it is abbreviated as $N_A$. The mass of one mole of a substance is called its molar mass. The molar mass of carbon is 12 grams per mole. Therefore, the mass of 6.023 × 1023 atoms of carbon is 12 grams.

Option B is incorrect because it is twice the molar mass of carbon. Option C is incorrect because it is half the molar mass of carbon. Option D is incorrect because it is one-tenth the molar mass of carbon.