To determine the correct answer, let's break down the steps:
1. Dimensional Analysis: When converting moles of a substance to grams, dimensional analysis is indeed the method we use. This involves using the molar mass of the substance to facilitate the conversion.
2. Oxidation State of Copper in CuO: In copper (II) oxide (CuO), copper has an oxidation state of [tex]\( +2 \)[/tex]. This is a fundamental fact in chemistry, as indicated by the Roman numeral II in the name of the compound.
3. Atomic Mass of Copper (II) Oxide: The atomic mass of copper (II) oxide (CuO) is calculated based on the atomic masses of copper (Cu) and oxygen (O).
- The atomic mass of copper (Cu) is approximately 63.55 grams per mole.
- The atomic mass of oxygen (O) is approximately 16.00 grams per mole.
- Therefore, the molar mass of CuO is [tex]\(63.55 + 16.00 = 79.55\)[/tex] grams per mole.
4. Combining All Information:
- We need to convert 4.2 moles of CuO to grams.
- Using the molar mass [tex]\(79.55\)[/tex] grams per mole, we multiply:
[tex]\[ \text{Mass} = \text{Moles} \times \text{Molar Mass} = 4.2 \, \text{moles} \times 79.55 \, \text{grams/mole} = 333.11 \, \text{grams} \][/tex]
Therefore, the statement that uses dimensional analysis, acknowledges the oxidation state of copper as [tex]\(2+\)[/tex], and states the molar mass of copper (II) oxide as [tex]\(79.55\)[/tex] grams per mole is correct.
Answer: All of the above
