# What is the total number of molecules represented by the equation 2C_4H_10(g) + 13O_2(g) -> 8CO_2(g) + 10H_2O(g)?

Adding up the coefficients of all molecular species mentioned in the balanced equation, we can get total number of molecules in the reaction represented by the equation and this becomes $2 + 13 + 8 + 10 = 33$