i just want to know how to do it
2007-03-07 10:04:21 · 3 answers · asked by †ღChristian♥Girlღ† 2 in Science & Mathematics ➔ Chemistry
the mass is 5.50 not 2.50
2007-03-07 10:24:16 · update #1
I'm not going to solve the problem but I will tell you how to do it. Each mol of FeBr2 has one iron atom and two bromine atoms. Go look up the molar/atomic masses of each of these elements on a periodic table and add the contribution that each makes to the molecule (one iron atom + 2 bromine atoms).
You should now have the molar mass of FeBr2. Since you have 2.5 mols of FeBr2, simply multiply the amount of moles by the molar mass to obtain the mass in grams.
2007-03-07 10:09:49 · answer #1 · answered by eckbomb 2 · 0⤊ 0⤋
Atomic weights: Fe = 55.8 Br = 80 FeBr = 216
2.50molFeBr2 x 216gFeBr2/1molFeBr2 = 540gFeBr2
The 2.50mol is given. The factor comes from the molecular weight. The molFeBr2 cancel, leaving gFeBr2, which was what was wanted.
2007-03-07 10:14:05 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋
eckbomb's answer above is correct and explained better than i could explain it!!
2007-03-07 10:11:44 · answer #3 · answered by WxEtte 5 · 0⤊ 0⤋