I have to solve this combustion problem using Dimensional Analysis and molar heat:

2 C2H6 +7O2 yields 4 CO2 + 6H2O + 3120 kJ

The question is to discover how much heat is produced along with 8 moles of water in this reaction.

My problem is that I have no idea how to go about solving this sort of problem. Is there a website with examples, or would you be able to show me step by step how to figure this out? Thank you so much for your help, I appreciate it.

Heat=8moleswater(3120kJ/6moleswater)

I took 8 moles and multiplied it by 3120 KJ and divided that by 6 moles to get 4160KJ

My calculator shows 4160 kJ also.

To solve this problem using Dimensional Analysis and molar heat, you can follow these steps:

Step 1: Understand the given reaction
The given reaction is:
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O + 3120 kJ

This means that when 2 moles of C2H6 react with 7 moles of O2, it produces 4 moles of CO2, 6 moles of H2O, and releases 3120 kJ of heat.

Step 2: Identify the relationship between moles and heat
To find how much heat is produced along with a certain number of moles of water, we need to know the molar heat of the reaction. In this case, the molar heat is given as 3120 kJ.

Step 3: Determine the moles of water
Since we are interested in the heat produced along with 8 moles of water, we need to calculate the moles of water from the balanced equation. From the equation, we see that for every 6 moles of H2O produced, 3120 kJ of heat is released.

Step 4: Set up the conversion factor
From the information given in the balanced equation, we can set up the conversion factor as follows:
6 moles H2O : 3120 kJ

Step 5: Calculate the amount of heat produced
To find the amount of heat produced along with 8 moles of water, we need to set up the following dimensional analysis equation:

8 moles H2O × (3120 kJ / 6 moles H2O) = X

Solving this equation gives us:
X = (8 moles H2O × 3120 kJ) / 6 moles H2O

Step 6: Calculate the answer
Calculate the value of X to find the amount of heat produced with 8 moles of water.

Now you can plug in the values and solve the equation to find the answer:
X = (8 moles H2O × 3120 kJ) / 6 moles H2O

X ≈ 4160 kJ

Therefore, approximately 4160 kJ of heat is produced along with 8 moles of water in this reaction.

If you need more examples or further guidance, there are several websites and textbooks that provide practice problems and explanations on dimensional analysis and molar heat calculations. Some recommendations include Khan Academy, Chemguide, and various chemistry textbooks.