chemistry help?

Question

2 Fe(s) + 3 Cl2(g) 2 FeCl3(s)

Calculate the mass of FeCl3 that is formed if 12.10 g of iron reacts.
i tried it many times, i got 12.10g but that is not the answer.

Answer 1

The no of moles of FeCl3 will be the same as the number of moles of Fe. That is not the same as the mass.

The molecular mass of Fe is 55.85 grams/mole,so 12.10 grams is 12.10/55.85 moles = 0.217 moles. This reaction will then produce 0.217 moles of FeCl3; the molar mass of F3Cl3 is 162.2 grams/mole, so the mass produced will be 0.217*162.2 = 65.1 g.

EDIT: I guess my calculator malfunctioned: 0.217*162.2 = 35.2g

Answer 2

From the equation,
2 moles Fe gives 2 moles FeCl3
1 mole Fe gives 1 mole FeCl3
56 g Fe gives 162.5 g FeCl3
12.10 g Fe gives [(162.5/56) * 12.10]g
12.10 g Fe gives 35.11 g FeCl3

i guess that is the answer: 35.11g (to 4s.f)