Question

How many grams of CO are needed to react completely with 0.3 moles of O2?2 CO (g) + O2 (g) → 2 CO2 (g)

Answer 1

In the chemical reaction, you can see that 1 mol of O2 reacts with 2 moles of CO, so the number of moles of CO will be this number multiplied by two. You can see this better, like this:

`0.3molesO_2\cdot\frac{2\text{ moles CO}}{1molO_2}=0.6\text{ moles CO.}`

Using this number and the molar mass of CO, which you can calculate using the periodic table ( 16 g/mol + 12 g/mol = 28 g/mol CO), we're going to obtain the mass of CO:

`0.6\text{ moles CO}\cdot\frac{28\text{ g CO}}{1\text{ mol CO}}=16.8\text{ g CO.}`

We need 16.8 grams of CO to complete the reaction with 0.3 moles of O2.