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# What is the empirical formula and empirical formula mass for each of the following compounds?$\begin{array}{ll}{\text { (a) } \mathrm{C}_{4} \mathrm{H}_{8}} & {\text { (b) } \mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}} & {\text { (c) } \mathrm{P}_{4} \mathrm{O}_{10}}\end{array}$(d) $\mathrm{Ga}_{2}\left(\mathrm{SO}_{4}\right)_{3} \quad$ (e) $\mathrm{Al}_{2} \mathrm{Br}_{6}$

## a) $\mathrm{CH}_{2} ; \mathrm{Mr}\left(\mathrm{CH}_{2}\right)=14,01 \mathrm{g} / \mathrm{mol}$b) $\mathrm{CH}_{2} \mathrm{O} ; \mathrm{Mr}\left(\mathrm{CH}_{2} \mathrm{O}\right)=30,01 \mathrm{g} / \mathrm{mol}$c) $\mathrm{P}_{2} \mathrm{O}_{5} ; \mathrm{Mr}\left(\mathrm{P}_{2} \mathrm{O}_{5}\right)=141,94 \mathrm{g} / \mathrm{mol}$d) $\mathrm{Ga}_{2}\left(\mathrm{SO}_{4}\right)_{3} ; \mathrm{Mr}\left(\mathrm{Ga}_{2}\left(\mathrm{SO}_{4}\right)_{3}\right)=427,62 \mathrm{g} / \mathrm{mol}$e)$\mathrm{AlBr}_{3} ; \mathrm{Mr}\left(\mathrm{AlBr}_{3}\right)=266,68 \mathrm{g} / \mathrm{mol}$

#### Topics

Chemical reactions and Stoichiometry

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##### Allea C.

University of Maryland - University College

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### Video Transcript

we have different compound. Were the first flight out of empirical formula. And what will be the mass off that empirical formula? Okay, so let's start with the M pickle. Former pupils are pretty easy. So foresee for H eight, we're going to find that for coming feathers for So we have C one h two. Okay, so for a second Sith E 603 Yeah, to comfortably three sort of see h 20 p. Four or 10. The common fatter would beat too. So we're pizza. 05 Okay, so for GE Valium, Sophie would be a bit complicated, so I would like to expand further expand that formula. So we rewrite at she hates you. Ah, sui 0/12. Yes, three or 12. Can we further Ah, simplify it? Um, I believe we, um We cannot believe recent ified way. We'll have an available rebel faction, so there's not ideal. So this will be the empirical for murder. Okay, so for all women to be out six So again, you're gonna see the common factor is how a Alfie Alfie. Okay, so the next step we're going to outfit or the table and then find out the mass off the empirical formula. So for the 1st 1 it will be a 14 grand for more. I'm going to skip in unit. Just do fire the number That's the second will be 12 12 plus two five 16. It will be a 30 and then for Peter. Oh, fi, we have ah forcers this for 2.97 times two for 16 times fly false agents. There's a wonderful 1.94 Forget himself. So we just let you file them or more. The mass of carrion self it. So ah, guy in was 69.72 times two ah, plus three times I was sell for its Fernie 2.7 plus 1200 times our oxygen. So you would be for 20 7.65 Kuemper mole. And therefore l remember my so we just find aluminum is 26 49 feet. Ah, plus broom. I, uh It's 79.9 times sweet. It would be to 66 0.66 68 grand for mo

University of Toronto

#### Topics

Chemical reactions and Stoichiometry

##### Allea C.

University of Maryland - University College

Lectures

Join Bootcamp