1. Write the balanced chemical equation:

The reaction between calcium (Ca) and oxygen (O₂) produces calcium oxide (CaO):

2 Ca + O₂ → 2 CaO

2. Calculate the molar mass of calcium oxide (CaO):

* Ca: 40.08 g/mol

* O: 16.00 g/mol

* CaO: 40.08 + 16.00 = 56.08 g/mol

3. Convert the mass of calcium to moles:

* Moles of Ca = (mass of Ca) / (molar mass of Ca)

* Moles of Ca = 36.5 g / 40.08 g/mol = 0.911 mol

4. Use the mole ratio from the balanced equation:

The balanced equation shows that 2 moles of Ca react to produce 2 moles of CaO. This means the mole ratio of Ca to CaO is 1:1.

5. Calculate the moles of calcium oxide produced:

Since the mole ratio is 1:1, the number of moles of CaO produced is equal to the number of moles of Ca reacted.

* Moles of CaO = 0.911 mol

Answer: 0.911 moles of calcium oxide are produced when 36.5 g of calcium react completely with oxygen gas.