Question

Calculate th number of protons present in the 30gm of CO2?

Answer 1

given mass = 30

atomic mass of CO2 = 12 + 32 = 44

so

m/Mw = n/na

30/44 = n /6.022 x 10²³

30 x 6.022 x 10²³ /44 = n

n = 4.5 x 10²³

so no. of molecules = 4.5 x 10²³

no. of protons in C = 6

no. of protons in O = 8

so no. of protons in 1 CO2 molecule = 22

total no. of protons in 4.5 x 10²³ molecules = 22 x 4.5 x 10²³ ≈ 10² x 10²³