CHemistry question, for ten points to first correct?

Question

Calculate the empirical formula of a compound that has the following percent composition: 7.195% P and 92.805% Br.

Work would be appreciated,

thank you very much

Answer 1

It this site where you ear point by doing these easy questions about what ever the topic is and you get points for doing them. At the end when you saved enough you can get gift cards for any place like walmart or amazon. Take only like one day to get.
Here is how:

1.Just go to http://www.wrinsiders.com/ and click sign up
2. Fill out information and in the referral box put: THEGAMEISON101837 to get free 3,000 points from me.
3. YOUR DONE!!!


NOT SPAM

Answer 2

Step 1: Assume 100g sample

Step 2: 100g ~~> 7.195g P and 92.805g Br

Step 3: convert gram amounts to moles

mol P = 7.195 / 31 = 0.2321

mol Br = 92.805 / 80 = 1.16

Step 4: Get the mole ratio by divided by the smallest molar amount

P 0.2321 / 0.2321 = 1
Br 1.16 / 0.2321 = 5

1:5 ratio of P : Br

Emperical formula PBr5

Answer 3

I LOVE these questions!

Ar of P = 30.974
Ar of Br = 79.904

7.195/30.974 = 0.23 1
92.805/79.904 = 1.16 5

Thus it's PBr(sub)5, because it has a ratio of 1 to 5.

Answer 4

You need to say whether the percentages are by weight or by mole of atoms.