Here's how to calculate the number of moles in 56 grams of carbon monoxide (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 formula:

* Moles = Mass / Molar Mass

3. Plug in the values:

* Moles = 56 g / 28.01 g/mol

* Moles ≈ 2.00 mol

Therefore, there are approximately 2.00 moles in 56 grams of carbon monoxide.