Balancing Equation Post Module Assessment

[Mahnoor_Wani_1I]

19. During a summer camping weekend 4 moles of butane (C4H10) gas were used for cooking. Chose the right balanced equation for the combustion of 4 moles of butane gas. What is the net number of moles of gas produced?

A. 4C4H10(g) + 26O2(g) → 16CO2(g) + 20H2O(g); 6

B. 4C4H10(g) + 26O2(g) → 16CO2(g) + 18H2O(g); 4

C. 4C4H10(g) + 25O2(g) → 16CO2(g) + 20H2O(g); 6

D. 4C4H10(g) + 26O2(g) → 16CO2(g) + 20H2O(g); 5

I was able to find the chemical equation to be : 4C4H10(g) + 26O2(g) → 16CO2(g) + 20H2O(g) but I don't know. how to find the net number of moles. Isn't just moles of CO2 + H20?

[Alvin Lai 3J]

So the coefficients in front of each compound is a mole. All you have to do is add up the total moles on the left and compare them to the total moles on the right. This should be 30->36, so the net moles is 6.

[Carly_Lipschitz_3H]

Basically it is just asking about the total moles on the reactants side vs the product side. I added up all the moles on each side. Then, I subtracted the number of moles on the products side from the reactants side to see the net number of moles of gas produced. So, it ends up being 36-30 = 6. Net moles is just asking to to see how many moles were gained or lost during the reaction.