Answer:
CaCl₂
Explanation:
First we convert the given masses of elements into moles, using their respective molar masses:
- 0.900 g Ca ÷ 40 g/mol = 0.0225 mol Ca
- 1.60 g Cl ÷ 35.45 g/mol = 0.045 mol Cl
Now we divide those numbers of moles by the lowest value among them:
- 0.0225 mol Ca / 0.0225 mol = 1
- 0.045 mol Cl / 0.0225 mol = 2
Meaning the empirical formula for the compound is CaCl₂.
