1.

4g of copper chloride on analysis was founded to contain 1.890 g of copper (Cu) and 2.110 g of chlorine (Cl). What is the empirical formula of copper chloride? [At. mass of Cu = 63.5 u, Cl = 35.5 u].

Answer»
Element%Atomic weightRelative no. of atomsDivide by leastSimplest ratio
Cu47.2563.547.25/63.5 = 0.740.74/0.74 = 11
Cl52.7535.552.75/35.5 = 1.481.48/0.74 = 22

Empirical formula = CuCl2.



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