question 1 (5 points)
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the subscripts in a chemical formula are the number of _______ of a particular atom in one mole of the molecule.
a) molecules
b) reactants
c) atoms
d) moles

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Accepted Answer

# Brief Explanations:
To solve this, we analyze each option:
- Option A: Subscripts in a chemical formula don't represent the number of molecules of an atom (atoms aren't molecules), so A is incorrect.
- Option B: Reactants are part of chemical reactions, not what subscripts in a formula represent, so B is incorrect.
- Option C: Subscripts in a chemical formula indicate the number of atoms of a particular element in a molecule. For example, in $\ce{H_2O}$, the subscript 2 means 2 atoms of hydrogen in one molecule (and one mole of the molecule has 2 moles of H atoms, but the subscript itself counts atoms in the molecule). Wait, no—actually, in terms of moles, the subscript also represents the number of moles of that atom in one mole of the molecule. Wait, let's re - evaluate. Wait, the question says "in one mole of the molecule". Let's think again. The subscript in a chemical formula (like in $\ce{CO_2}$) tells us that in one molecule of $\ce{CO_2}$, there is 1 C atom and 2 O atoms. When we have one mole of $\ce{CO_2}$ molecules, we have 1 mole of C atoms and 2 moles of O atoms. But the subscript is originally about the number of atoms in a molecule, and by extension, the number of moles of that atom in one mole of the molecule. Wait, but the options: D is "moles". Wait, maybe I made a mistake earlier. Let's re - analyze each option:
  - Option A: Molecules of an atom? Atoms are not molecules, so A is wrong.
  - Option B: Reactants are not related to subscripts in a formula (formula is about the compound, not the reaction), so B is wrong.
  - Option C: The subscript in a formula (e.g., $\ce{H_2O}$) first and foremost represents the number of atoms of that element in one molecule. But when considering one mole of the molecule, the number of moles of that atom in one mole of the molecule is equal to the subscript. Wait, but the question is phrased as "the number of ____ of a particular atom in one mole of the molecule". Let's take $\ce{H_2O}$: one mole of $\ce{H_2O}$ has 2 moles of H atoms. So the subscript 2 represents the number of moles of H atoms in one mole of $\ce{H_2O}$? Wait, no—maybe the confusion is between atoms in a molecule and moles in a mole of the molecule. Wait, let's check the definitions. The subscript in a chemical formula indicates the number of atoms of each element in a single molecule. When we scale up to moles, one mole of the molecule contains a number of moles of each atom equal to the subscript. For example, 1 mole of $\ce{H_2O}$ contains 2 moles of H atoms and 1 mole of O atoms. So the subscript represents the number of moles of that atom in one mole of the molecule. Wait, but option C is "atoms" and option D is "moles". Wait, maybe I messed up. Let's re - read the question: "The subscripts in a chemical formula are the number of ____ of a particular atom in one mole of the molecule." Let's take $\ce{H_2O}$: in one mole of $\ce{H_2O}$ (which is $6.022	imes10^{23}$ molecules), the number of moles of H atoms is 2. The number of atoms of H in one mole of $\ce{H_2O}$ is $2	imes6.022	imes10^{23}$, but the subscript is related to moles here. Wait, no—maybe the question is a bit tricky. Wait, the subscript in the formula (e.g., $\ce{NaCl}$ has no subscript for Na and Cl, meaning 1:1 ratio) represents the number of moles of each atom in one mole of the compound. Wait, let's check the options again. Option D: "moles". Let's see: in $\ce{H_2O}$, subscript 2 for H means 2 moles of H atoms in 1 mole of $\ce{H_2O}$. Option C: atoms—if we say "number of atoms of a particular atom in one mole of the molecule", that would be Avogadro's number times the subscript, but the subscript itself isn't the number of atoms (it's a multiplier for the number of atoms). Wait, I think I made a mistake earlier. Let's correct this. The subscript in a chemical formula indicates the number of moles of that atom in one mole of the molecule. For example, in $\ce{CO_2}$, 1 mole of $\ce{CO_2}$ contains 1 mole of C atoms and 2 moles of O atoms. The subscript 2 for O means 2 moles of O atoms in 1 mole of $\ce{CO_2}$ molecules. So the correct answer should be D? Wait, no—wait, let's go back to the basic definition. The subscript in a chemical formula (like $\ce{H_2}$) shows that there are 2 H atoms in one $\ce{H_2}$ molecule. When we have 1 mole of $\ce{H_2}$ molecules, we have 2 moles of H atoms. So the subscript, in the context of one mole of the molecule, represents the number of moles of that atom in one mole of the molecule. So the answer is D? Wait, but I was confused earlier. Let's check the options again:
  - Option C: "atoms"—if the question was about one molecule, it would be atoms, but it's about one mole of the molecule. So in one mole of the molecule, the number of moles of the atom is equal to the subscript. So the subscript represents the number of moles of that atom in one mole of the molecule. So D is correct? Wait, no—maybe I have the concept wrong. Let's check a chemistry textbook definition. The subscript in a chemical formula indicates the number of atoms of each element in a molecule. When considering moles, the number of moles of each element in one mole of the compound is equal to the subscript. For example, 1 mole of $\ce{H_2O}$ contains 2 moles of H atoms and 1 mole of O atoms. So the subscript gives the number of moles of that atom in one mole of the molecule. So the correct option is D. Wait, but earlier I thought C, but that was a mistake. Let's re - check the options:
    - Option A: Molecules of an atom? No, atoms are not molecules.
    - Option B: Reactants? No, formula is about the compound, not the reaction.
    - Option C: Atoms in one mole of the molecule? The number of atoms in one mole of the molecule would be (subscript) $	imes$ Avogadro's number, but the subscript itself is not the number of atoms (it's a multiplier). The subscript represents the number of moles of the atom in one mole of the molecule. So D is correct.
# Answer:
D) moles

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