Multiple Choice
How many oxygen atoms are present in one formula unit of Al(PO4)3?
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3. Chemical Reactions
Molecular Formula
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Which of the following is the correct molecular formula for ammonia?
A
N2H4
B
NO2
C
NH3
D
NH4
Verified step by step guidance1
Step 1: Understand that the molecular formula represents the actual number of atoms of each element in a molecule.
Step 2: Recall that ammonia is a well-known compound composed of nitrogen and hydrogen atoms.
Step 3: Identify the correct ratio of nitrogen to hydrogen atoms in ammonia, which is one nitrogen atom bonded to three hydrogen atoms.
Step 4: Compare the given options to this ratio: N2H4 has two nitrogens and four hydrogens, NO2 contains nitrogen and oxygen, NH3 has one nitrogen and three hydrogens, and NH4 has one nitrogen and four hydrogens.
Step 5: Conclude that the molecular formula matching the known composition of ammonia is \(NH_3\).
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