The mass of a proton is 1.67 x ${{10}^{-27}}$ kg. How many protons would make 1 g?

[prasanna]

Number of protons = Total mass / Mass of each electron
= ${{10}^{-3}}$ / 1.67 x ${{10}^{-27}}$
= 5.99 x ${{10}^{23}}$