Question

What is the empirical forumla (lowest whole ratio) of the compounds below?

A.

13.0g Mg 1 mole/24.312 = .53 mole
87.0g Br 1 mole/79.909g = 1.09 mole

Mg .53/.53 Br 1.09/.53

Mg 1.0 Br 2.1

What do i do now?

Answer 1

I didn't check your math but if it's correct, round the 2.1 to 2.0 and the formula is Mg1Br2.0 or MgBr2.

Answer 2

you just write it as MgBr2

Answer 3

since when is 2.054 rounded up .

Round it to the nearest whole number
MgBr2

Answer 4

My teacher told me what I needed to get both numbers to whole numbers by mutiplying 2-6. But i do not know when to do it. Can you please give me an example

Answer 5

http://books.google.com/books?id=EKOBuCwHh9wC&pg=PA29&lpg=PA29&dq=empirical+formula+C3H8&source=web&ots=2XWO2gHpDo&sig=CQMIhjMo-rkgb0Quz5KGGpXXQMs&hl=en&sa=X&oi=book_result&resnum=3&ct=result#PPA30,M1

See prob 3-2, where they had to multipy by 2 to get a whole number ratio