Calculate the number of molecules in one Kg of calcium chloride.

Numerical

Molecular mass of CaCl₂ = 40 + (35.5 x 2) = 111

111 g of CaCl₂ contain molecules= 6.02 x 10²³

∴ 1kg = 1000 g of CaCl₂ contain molecules

= `602/(111 xx 100) xx 1000 xx 10^23`

= `6020/111 xx 10^23`

= 5.42 x 10²⁴

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