Ncert Exercises & Solutions

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

1 mole of carbon atoms = 6.023 × 1023 atoms of carbon
= 12 g of carbon

∴

Mass of one

{}_{12}C

atom =

\frac{12 g}{6.022 x 10^{23}}

= 1.993 ×

10^{- 23}