Question

Calculate the number of oxygen atoms and its mass in 50 g of caco3.

Answer 1

Hi friend

To solve such questions first calculate no of moles

CaCO3 has moles 50/100 = 0.2

so 1 mole of CaCO3 has 3 mol Oxygen

so 0.2 mol would have 0.2×3 =0.6 mol oxygen to calculate the number we multiply by avogadro number

so no of oxygen atoms = 0.6×6.022×10^23

= 3.6× 10 ^23

hope you understood