At the end of a chemical reaction, what is the total mass of the reactants compared to the total mass of the products?

What are the resulting coefficients when you balance the chemical equation for the combustion of ethane, c2h6? in this reaction, ethane is burned in the presence of oxygen (o2) to form carbon dioxide (co2) and water (h2o). (g)+(g)→(g)+(g)

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?