A 15-g sample of lithium is reacted with 15 g of fluorine to form lithium fluoride: 2Li + F2 --> 2LiF. After the reaction is complete, what will be present?
I think I start by dividing 15 g by the molar masses, but is the molar mass
2 x amu of Li and 2 x amu of F?
Thanks
2007-01-28 11:45:16 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
You will need to work stoich twice to do this problem - once for Li --> LiF, and once for F --> LiF
1)
15 g Li / 7 g Li per mole = moles Li
answer x 2 mol Li / 2 mol LiF formed
answer x mass LiF = grams of LiF formed from 15 g Li
2)
15 g F2 / mass F2 = moles F2
answer x 1 mol F2 / 2 mol LiF formed
answer x mass LiF = grams of LiF formed from 15 g F2
The smaller answer from 1 and 2 above gives you how much LiF you can form.
2007-01-28 12:03:13 · answer #1 · answered by physandchemteach 7 · 0⤊ 0⤋
LOL, a 105a student....yeah i have 11 hours left to finish that heh heh
2007-01-29 04:16:22 · answer #2 · answered by achaminadefriend 5 · 0⤊ 0⤋