객관식
Which of the following pairs of compounds do NOT have the same empirical formula?
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3. Chemical Reactions
Empirical Formula
객관식
How many atoms of calcium, phosphorus, and oxygen are present in one formula unit of Ca3(PO4)2?
A
3 calcium, 4 phosphorus, 8 oxygen
B
3 calcium, 2 phosphorus, 8 oxygen
C
3 calcium, 2 phosphorus, 6 oxygen
D
3 calcium, 2 phosphorus, 8 oxygen
검증된 단계별 안내1
Identify the chemical formula given: Ca3(PO4)2. This represents one formula unit of the compound.
Determine the number of calcium (Ca) atoms directly from the formula. The subscript 3 outside Ca indicates there are 3 calcium atoms.
Look inside the parentheses (PO4) and note the subscript 2 outside the parentheses. This means the entire PO4 group is present twice.
Count the atoms inside the PO4 group: 1 phosphorus (P) atom and 4 oxygen (O) atoms. Since there are 2 such groups, multiply each by 2.
Calculate the total atoms: Phosphorus atoms = 1 × 2 = 2, Oxygen atoms = 4 × 2 = 8. So, the formula unit contains 3 calcium, 2 phosphorus, and 8 oxygen atoms.
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