help, i think the book is wrong...what you think?

3 ⤊

help, i think the book is wrong...what you think?

when 10 g of zinc and 8 g of sulfur are allowed to react, all the zinc is used up, 14.9 g of zinc sulfide is formed and some unreacted sulfur remains. the mass of unreacted sulfur is___
My answer is 3.1 g
book answer is 4.9 g

2007-06-27 08:57:39 · 3 answers · asked by soulsearching 2 in Science & Mathematics ➔ Chemistry

3 answers

Zn + S = ZnS
10g Zn => 10.0 / 65.38 = 0.153 moles
0.153 moles of S = 0.153 x 32.066 = 4.906 g
8g S - 4.906g = 3.09g
You are right and the book made a boo-boo.

2007-06-27 09:04:18 · answer #1 · answered by skipper 7 · 1⤊ 0⤋

3.1g is correct. The book is wrong. Total mass must be conserved. This of course assumes there are no other byproducts of the reaction.

2007-06-27 16:00:31 · answer #2 · answered by Michael C 7 · 1⤊ 0⤋

I'd go with your answer!

2007-06-27 16:01:16 · answer #3 · answered by Anonymous · 1⤊ 0⤋