Are Form 2220 Compute 2023-2024

Here we're going to learn how to solve problems like these. We're given the empirical formula and the molar mass of a compound, and we have to figure out that compound's molecular formula. We're asked to determine the molecular formula of a compound with the empirical formula CF2 and a molar mass of 200.4 grams per mole. Let's begin by making a chart. Okay, so here's a formula, the empirical formula that we're starting with, and I want to find its molar mass. So to do that, I'll look up carbon and fluorine on the periodic table. I do 1 times the molar mass of carbon plus 2 times the molar mass of fluorine, and I get 50.01. Okay, now CF2. This here is an empirical formula, which means that the number of atoms here, the ratio of atoms here, is as simplified or reduced as possible. Now there are a number of different molecular formulas that all have CF2 as their empirical formula. Okay, for example, C2F4 is a molecular formula that has this as its empirical formula. Okay, if we took both of these numbers and divided them by 2, we'd end up with CF2. And going the other way, we can kind of say that we got this formula by taking the empirical formula and multiplying it by 2. In other words, this here, this formula, is kind of a multiple of the empirical formula. We multiply it by 2 and we get this. Now, it's the same for the molar mass. Okay, we take the empirical formula, multiplied by 2, and get this. To find the molar mass of C2F4, we can just take the molar mass of the empirical formula, multiply it by 2, and get the molar mass of C2F4, 100.2. Twice what this...