Question

Sum of number of protons electrons and neutrons in 12g C12 is

Answer 1

molar mass :- Mass of the one mole of the substance
molar mass of carbon = 12g/mol

means 12 gramm contains avogadro number of atoms i.e 6.022 × 10^23
1 atom contains = 6 proton
1 atom contains = 6 electron
1 atom contains = 6 neutrons

then 12 g contains
= 6 × 6.022 × 10^23
= 36.132 × 10^23
= 36 × 10^23
= 3.6 × 10^24

similarly 12 g contains 3.6 × 10^24 neutrons and protons

and there sum
= (3.6 × 10^24) + (3.6 × 10^24) + (3.6 × 10^24)
= 10.8 × 10^24