We’re being asked to give the percent composition of chlorine of in cobalt(II) chloride hexahydrate
The mass percent formula is shown below:
Step 1: Determine the molecular formula:
The rules ionic compounds are as follows:
1. The metal keeps its name and is named and written first.
– For transition metals, we use Roman numerals to denote its charge
2. The nonmetal keeps its base name but has its ending changed to –ide.
3. Hydrate is H2O with written alone with the numerical prefix.
What is the percent composition of chlorine in cobalt(II) chloride hexahydrate?
A. 29.8% B. 24.8% C. 47.9%
D. 39.8% E. 54.6%