How much oxygen is required to burn 3 moles of carbon monoxide (||)?

Given: N (CO) = 3 mol
Find: N (O2) = x mol
Solution.
1. Let’s write the reaction equation.
2 CO + O2 = 2 CO2
The coefficients in the reaction equation show the quantities of substances in moles. That is, to burn 2 mol of carbon monoxide (2), 1 mol of oxygen is needed.
2. We make up the proportion:
according to the equation for 2 mol of CO, 1 mol of O2 is needed,
according to the condition, for 3 mol of CO, x mol of O2 is needed, hence
2/3 = 1 / x, x = 3 * 1/2, x = 1.5 mol.
Answer: To burn 3 moles of carbon monoxide (2), you need 1.5 moles of oxygen.