Need help on this empirical formula  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

Jaipaul_Bhangu_3H
Posts: 12
Joined: Wed Sep 21, 2016 2:56 pm

Need help on this empirical formula

Postby Jaipaul_Bhangu_3H » Fri Oct 07, 2016 8:11 pm

Hey guys, I just need some help on this empirical formula problem. Can someone please walkthrough this problem for me?
Attachments
Screen Shot 2016-09-19 at 2.32.15 PM.png

Sebastian
Posts: 15
Joined: Wed Sep 21, 2016 2:56 pm

Re: Need help on this empirical formula  [ENDORSED]

Postby Sebastian » Fri Oct 07, 2016 8:34 pm

First, due to the law of conservation of mass, you know that of the 996.08 resulting grams, 339.2 grams of it must be the initial cobalt, as they did not specify any errors or other products. This means that the final compound is 339.2 grams of Cobalt 656.88 grams. Then you calculate mols of each element through the molar mass given, which equals 5.75 mols of Cobalt and 34.57 mols fluorine. Then divide by the smaller of the two mols, just as you would do in a percent mass problem. This gives you a ratio of 1 Cobalt to 6 Fluorine, making the answer (D).

Jaipaul_Bhangu_3H
Posts: 12
Joined: Wed Sep 21, 2016 2:56 pm

Re: Need help on this empirical formula

Postby Jaipaul_Bhangu_3H » Sat Oct 08, 2016 11:04 am

Thanks :)


Return to “Empirical & Molecular Formulas”

Who is online

Users browsing this forum: No registered users and 1 guest