In a car gas tank, 46.0 g of gasoline burns consuming 173 g of oxygen. The resultant products are carbon dioxide are carbon dixide and water. What is the total combined mass of the products?

Would it be 173g - 46.0g = 127g

2 answers

46.0 g gasoline + 173 g oxygen = total mass to start of 219.0 grams. Since CO2 and H2O are the only products formed, their total weight must be 219.0 grams. Law of conservation of mass. Check my arithmetic.
Oh! I get it thanks!