Question

What will be the mass of one ¹²C atom in g?

Answer 1

1 mol of ¹²C atoms = 6.022 × 10²³ atoms = 12 g 

Thus, 6.022 × 10²³ atoms of ¹²C have mass = 12 g 

∴ 1 atom of ¹²C will have mass =  \(\frac{12}{6.022\times10^{23}}g\) = 1.9927 × 10^-23 g