객관식
Which of the following is NOT an empirical formula?
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3. Chemical Reactions
Empirical Formula
객관식
Which of the following statements about empirical and molecular formulas is correct?
A
The empirical formula gives the exact number of atoms of each element in a molecule.
B
The molecular formula is always identical to the empirical formula.
C
The empirical formula represents the simplest whole-number ratio of atoms in a compound.
D
Empirical formulas can contain fractional subscripts.
검증된 단계별 안내1
Understand the definition of an empirical formula: it represents the simplest whole-number ratio of atoms of each element in a compound, not necessarily the exact number of atoms.
Recognize that the molecular formula shows the actual number of atoms of each element in a molecule, which can be a multiple of the empirical formula.
Note that the empirical formula cannot have fractional subscripts because it must represent whole-number ratios.
Recall that the molecular formula is not always identical to the empirical formula; it can be the same or a whole-number multiple of it.
Conclude that the correct statement is: 'The empirical formula represents the simplest whole-number ratio of atoms in a compound.'
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