Multiple Choice
Which one of the following is NOT an empirical formula?
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3. Chemical Reactions
Empirical Formula
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How many total atoms are present in one formula unit of cobalt hydroxide, Co(OH)_2?
A
3
B
6
C
4
D
5
Verified step by step guidance1
Identify the chemical formula given: Co(OH)\_2, which represents cobalt hydroxide.
Break down the formula into its constituent atoms: one cobalt (Co) atom, and the hydroxide group (OH) repeated twice.
Count the atoms in the hydroxide group: each OH contains 1 oxygen (O) atom and 1 hydrogen (H) atom, so OH has 2 atoms total.
Since there are 2 hydroxide groups, multiply the atoms in OH by 2: 2 \times 2 = 4 atoms from hydroxide groups.
Add the cobalt atom to the total atoms from hydroxide groups: 1 (Co) + 4 (from 2 OH groups) = 5 total atoms in one formula unit.
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