Question

calculate number of electrons, protons and neutrons in 32 gram of O2

Answer 1

1 atom of O have 8 electron 8 proton 8 neutrons
1 molecule O2 have 16 electron 16 proton 16 neutrons

number of molecules = number of moles × 6.022 × 10^23
number of molecules = mass/molar mass × 6.022 × 10^23
number of molecules = 32/32 × 6.022 × 10^23
number of molecules = 6.022 × 10^23

32 g have 6.022 × 10^23 molecules

Then number of electron
= 16 × 6.022 × 10^23
= 96.352 × 10^23
= 9.6352 × 10^24

similarly
number of proton = 9.6352 × 10^24
number of neutrons = 9.6352 × 10^24