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Your balancing seems fine I think this textbook might have the wrong answer

When chemical reactions happen the reactants react in number of moles and not in mass. So, Molar mass is not required in this question. What that balanced reaction equation tells us is that you need 2 moles of ethane to react with 7 moles of oxygen gas to produce 6 moles of H20 and 4 moles of...

Balance the equation using the ratios and then using the ratios you will be able to determine. Again understanding how chemical reactions occur will help you a lot I recommend you go back and relearn.

Hi so this a very good question. This question is about the calculations of stoichiometric ratios. I will be assuming you know how chemical reactions occur and what happens in them (Understanding this concept is very important before you start learning to do calculations as it will make the...