The actual yield of Magnesium Oxide in trial one is 0.414g, and in trial two it's 0.410. With this information, what is the theoretical yield of MgO (in both trials) with Magnesium as the limiting reactant.
What is the percent yield of MgO for each trial.
What is the average percent yield of MgO for both trials.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

if you mean hydrogen and oxygen then water is the product

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.