Given the equation below, determine the number of moles O2 required to completely react with 28 moles of CO.

1. D (24.0 moles CO2)

2. A (.239 moles H2)

Explanation:

1. First Balance the equation

1 C3H8 + 5 O2 ---> 3 CO2 + 4 H2O

Then set up a stoiciometric equation so that the moles of O2 cancel out

40mol O2 x = 24.0 moles CO2

2. Set up a stoichiometric equation

10 grams Fe x x = 0.239 moles H2

14 moles O₂

Explanation:

The equation of the reaction is:

2CO(g)  +  O₂(g)  ⇄  2CO₂(g)    (1)

28 moles

Hence, from equation (1) we have that 2 moles reacts with 1 mol of O₂, so, the number of moles of O₂ required to completely react with 28 moles of CO is:

Therefore, the number of moles of O₂ is 14 moles.  

I hope it helps you!