Many metals react with oxygen gas to form the metal oxide. For example, calcium reacts as follows:

Calculate the mass of calcium oxide that can be prepared from

of  and  of . Be sure your answer has the correct number of significant figures.

To solve this problem, we need to use stoichiometry and the balanced chemical equation for the reaction between calcium (Ca) and oxygen gas (O₂) to form calcium oxide (CaO).

The balanced chemical equation for this reaction is:

\[
2 \text{Ca} + \text{O}_2 \rightarrow 2 \text{CaO}
\]

### Step 1: Convert the given mass of calcium and oxygen into moles.
To do this, we use the molar masses of calcium and oxygen:
- Molar mass of calcium (Ca) = 40.08 g/mol
- Molar mass of oxygen (O₂) = 32.00 g/mol

Let’s assume you have two values for the masses of calcium and oxygen gas (since those were missing). Please provide the missing masses of calcium and oxygen, and I'll continue the calculation based on those values.

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Would you like to proceed with an example using standard values, or could you provide the specific masses you're working with?

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### Sample follow-up questions:
1. What role does the limiting reagent play in this reaction?
2. How can you determine the limiting reagent between calcium and oxygen?
3. Why is it important to have the correct number of significant figures?
4. What happens if excess calcium or oxygen is present?
5. How does the reaction rate change with different surface areas of calcium?

**Tip**: Always verify that your chemical equations are balanced before starting stoichiometric calculations to ensure accurate results.

Many metals react with oxygen gas to form the metal oxide. For example, calcium reacts as follows: Calculate the mass of calcium oxide that can be prepared from a given amount of calcium and oxygen. Be sure your answer has the correct number of significant figures.

Learn how to calculate the mass of calcium oxide formed from a reaction between calcium and oxygen using stoichiometry. This solution explains the balanced chemical equation, molar mass calculations, and significant figures, suitable for high school chemistry students.

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