Chemistry

Question Analysis
This question assesses the student's understanding of how to calculate the number of specific atoms in a given number of moles of a compound.

Key Concept Explanation
In a compound, the number of each type of atom can be determined by multiplying the number of moles of the compound by Avogadro's number and then by the number of that type of atom in the compound.

Step-by-step Solution
1. Identify the given number of moles: 0.75 moles.
2. Use Avogadro's number: .
3. Determine the number of oxygen atoms per molecule of : 2.
4. Calculate the total number of oxygen atoms:

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