Question

Calculate the number of of particle in
1)8 gram of oxygen molecule
2)2.5of mole of calcium atom

Answer 1

(i) 32g of O2 have molecules = 6.022 X 10^23

So, 8g of O2 have molecules = (6.022 X 10^23/32) x 8

= 1.5 x 10^23 molecules

(ii) 1 mol of calcium have a = 6.022 X 10^23 atoms

So, 2.5 mol of calcium have a = 6.022 X 10^23 x 2.5

= 15.055 x10 ^23 atoms

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