2c2h2 + 5o2 → 4co2 + 2 h2o how many grams of co2 are required to react with exactly 3.00 mol of o2? 106 g 132 g 165 g 76.8 g

Hey there!:

Given the reaction:

2 C2H2 + 5 O2 → 4 CO2 + 2 H2O

5 moles O2 4 moles CO2

3.00 moles O2  ( moles of CO2 ?? )

moles of CO2 = 3.00 * 4 / 5

moles of CO2 =  12 / 5

moles of CO2 = 2.4 moles

So, molar  mass CO2 = 44.01 g/mol

Therefore:

1 mole CO2 44.01 g

2.4 moles CO2 ( mass of CO2 )

mass of CO2 = 2.4 * 44.01 / 1

mass of CO2 = 106 g

Answer A

Hope that helps!

it means there are 3 atoms of oxygen