Here's how to calculate the moles of CO molecules in 52g of CO:

1. Find the molar mass of CO:

* Carbon (C) has a molar mass of 12.01 g/mol

* Oxygen (O) has a molar mass of 16.00 g/mol

* Molar mass of CO = 12.01 g/mol + 16.00 g/mol = 28.01 g/mol

2. Use the molar mass to convert grams to moles:

* moles = mass / molar mass

* moles = 52 g / 28.01 g/mol

* moles ≈ 1.86 mol

Therefore, there are approximately 1.86 moles of CO molecules in 52g of CO.