Question

Calculate the total number of electrons 640gm of o2

Answer 1

see it               ZXXXXXXXXXXXXXXXXXXXXXxxxxExplanation:

Answer 2

Explanation:

molar mass of O2=16u

so 1 mole =16u

no. of mole in 640g=640/16= 40

so 1 mole contain 6.022 ×10²³ electron

therefore 40mole contain 40×6.022×10²³=240.88×10²³