Question

Iron pyrites, FeS2 (molar
mass of Fe = 56g/mol), is
converted into Ferric
oxide and Sulphur dioxide.
The mass of the residue
left behind from 1.08g Iron
pyrites ignited to a
constant mass of air would
be *​

Answer 1

Answer:

Molecular weight of FeS

2

=56+2(32)=120 g/mol.

One mole (120 g) of FeS

2

will contain 2×32=64 g of S

30 g of FeS

2

will contain

120

30

×64=16 g of S.

Hence, the mass of sulfur contained in 30 grams of pyrites is 16 g.