Register to reply

Question regarding empirical formula and molecular formula(finding 2 variables)A Lvel

Share this thread:
Mar5-12, 07:56 PM
P: 93
1. The problem statement, all variables and given/known data

question 10

2. Relevant equations

3. The attempt at a solution
The way I am doing it, is to get two equations in terms of x and y and then equate them. For the first equation I used the fact that all of the element's individual atomic masses will add up to 571.5. So i got 27x + 28.1y = 172
My problem now is how to get the second equation? I think it has something to do with the empirical formula, but I can't figure it out. Help!
Phys.Org News Partner Science news on
Wildfires and other burns play bigger role in climate change, professor finds
SR Labs research to expose BadUSB next week in Vegas
New study advances 'DNA revolution,' tells butterflies' evolutionary history
Mar6-12, 07:20 AM
P: 427
If you remove the Al and Si from the formula, what is the charge on the resulting ion?
Mar6-12, 07:34 AM
Borek's Avatar
P: 23,400
What is 14.04% of 571.5?

Mar6-12, 10:43 PM
P: 93
Question regarding empirical formula and molecular formula(finding 2 variables)A Lvel

Quote Quote by Borek View Post
What is 14.04% of 571.5?
I think I got it, thanks to you. So for x we find 14.17% of 571.5. That answer we divide by 27, (because we know that the mole of aluminium is 1), and the x i got is 2.999(pretty close to one of the options). Same for y. Thanks!

Register to reply

Related Discussions
Empirical and molecular formula Chemistry 1
What is the Empirical and Molecular Formula of Caffeine? Biology, Chemistry & Other Homework 0
Finding Empirical Formula Question Biology, Chemistry & Other Homework 1
Molecular Formuals from Empirical Formula Help Please! Biology, Chemistry & Other Homework 2
From empirical formula to molecular formula (need help) Biology, Chemistry & Other Homework 6