Hi. I'm trying to find the elemental composition of pure substances. Kahn Academy is telling me to multiply by 5 for this problem to find the answer. How do I know what integer to use? Question: "A sample of a compound containing only carbon and hydrogen atoms is completely combusted, producing 110.0 g C02 and 27.0 g H20. Find the empirical formula."

Hint 3 of 4: "Next, let’s find the simplest whole number ratio of atoms in the compound by dividing each of the mole values for carbon and hydrogen by the smallest of the two values. To obtain whole numbers, we also need to multiply by an integer:

C: 2.5/2.5 = 1 C x 5 = 5 carbons
H: 3.0/2.5 = 1.2 H x 5 = 6 hydrogens

​Where are the 5's above coming from?

These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.