How do I find the percentage composition of Chlorine in #CoCl_2#?

1 Answer
Meave60
Mar 16, 2016

The percent composition of chlorine in #"CoCl"_2"# is #54.611%#.

Explanation:

First determine the molar mass of cobalt chloride #("CoCl"_2")# and the mass of chlorine in the compound. Divide the mass of chlorine by the molar mass of cobalt chloride, then multiply by 100.

Molar Mass of Cobalt Chloride

#"CoCl"_2":##overbrace((1xx58.933195 "g/mol"))^color(blue)"cobalt"+overbrace((2xx35.453 "g/mol"))^color(red)"chlorine"=overbrace"129.839 g/mol"^color(purple)"cobalt chloride"#

Mass of Chlorine in Cobalt Chloride

#"Cl"_2":##(2xx35.453 "g/mol")="70.906 g/mol"#

Percent Composition of Chlorine

#%"Composition of Cl"=(70.906 cancel"g/mol")/(129.839 cancel"g/mol")xx100="54.611% #

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