hacienda Posts: 5, Reputation: 1 New Member #1 Sep 9, 2010, 09:34 AM
0.310 mol of reacts with 0.810 mol of oxygen. How many moles of water are produced
 hacienda Posts: 5, Reputation: 1 New Member #2 Sep 9, 2010, 09:35 AM
0.310 mol of reacts with 0.810 mol of oxygen. How much octane is left?
 DrBob1 Posts: 425, Reputation: 86 Full Member #3 Sep 9, 2010, 09:53 AM
You need to post the balanced equation; we will check it for you.

The equation will tell how much octane is consumed by 0.810 moles of O2. The difference is the moles or grams of residual octane.

Post your work and we will check it for you.
 DrBob1 Posts: 425, Reputation: 86 Full Member #4 Sep 9, 2010, 09:57 AM
You need to post the balanced equation; we will check it for you.

The equation tells how many moles of water is produced from the 0.810 moles of O2.

Post your results and we will check that too.
 hacienda Posts: 5, Reputation: 1 New Member #5 Sep 9, 2010, 10:13 AM
Comment on DrBob1's post
Balanced Equation C8H18(g) + O2(g) → CO2(g) + H2O(g). 2 C8H18(g) + 25 O2(g) = 16 CO2(g) + 18 H2O(g)

 hacienda Posts: 5, Reputation: 1 New Member #6 Sep 9, 2010, 10:15 AM
Comment on DrBob1's post
C8H18(g) + O2(g) → CO2(g) + H2O(g). 2 C8H18(g) + 25 O2(g) = 16 CO2(g) + 18 H2O(g)

 Unknown008 Posts: 8,076, Reputation: 723 Uber Member #7 Sep 9, 2010, 11:57 AM

Ok, so, 2 moles of C8H18 consumes 25 moles of oxygen gas.

So, 1 mole of octane consumes (25/2) = 12.5 moles of oxygen gas.
or 1 mole of oxygen burns (2/25) = 0.08 moles of octane

And,

0.310 moles of octane consume (12.5x0.310) = 3.875 moles of oxygen gas.

Or

0.810 moles of oxygen gas burns (0.08x0.810) = 0.0648 moles of octane.

How much octane is left can be easily found now :)
 Unknown008 Posts: 8,076, Reputation: 723 Uber Member #8 Sep 9, 2010, 12:00 PM

From what I told you to do in my previous post, try working the amount of moles of water out now :)
 DrBob1 Posts: 425, Reputation: 86 Full Member #9 Sep 10, 2010, 11:56 AM
Maybe this is a trick question: there is such a small amount of oxygen that I wonder if it will burn at all!

 Question Tools Search this Question Search this Question: Advanced Search

## Check out some similar questions!

How many grams are in 5.66 mol of CaCO3? [ 3 Answers ]

How many grams are in 5.66 mol of CaCO3?

The moles of NO to react with are?

Determine the mass of 18 mol N. [ 1 Answers ]

It's a chemistry question.

Mol Mol Conversion [ 2 Answers ]

How do you solve mol mol conversions? For example: there are 14.5 mol N2 but trying to find the mol of H2 and it need to produce 22.5 mol NH3. The equation is: N2 + 3H2 ---> 2NH3