Fundamentals M21

[Katie Shi 1F]

Hello, I was having some trouble with problem M21 and was wondering if anyone could help explain. Thank you!

[Eszter Kovacs 1A]

Hi!

I'd start by trying to find the mass of each element in the molecule. We know that 0.500 grams of compound produced 0.130 g of N2, which makes up 26% of the compound. For the first half of the problem divide the mass of the CO2 and H2O with the molar mass of CO2 and H2O, which will help you get the amount of C and H atoms in moles. You can convert the moles back to mass using the molar mass of each element. We know that in the first half we had 1.35 g of compound, 26% of which is nitrogen, we also know the mass of C and H, so the last thing you need to do is subtract the the mass of N,C,H from 1.35 to get the mass of oxygen. Once you get the masses you can calculate the empirical formula.

[705573518]

I am having trouble finding the solution manual to help me check this problem. Can anyone direct me to where I may find it? thanks!

[Neha Mukund]

It should be in the textbook; There is a section called "Odd-numbered exercises" In the back matter part of the textbook. Hope that helped.

[Rebekah Han 2K]

Was M21 included in the set of textbook questions that were stated in the "Review of Chemical & Physical Principles" outline? I'm looking at the outline and the M questions stop at 19.

[Katie Shi 1F]

Thank you Eszter! Also Rebekah, it wasn't in the set of textbook questions but it was an example we did in my discussion section.