Question

Equal masses of iron and Sulphur are heated together to form FeS. What fraction of the original mass
of excess reactant is left unreacted? (Fe = 56, S = 32)​

Answer 1

Answer:

Fe+S→FeS

Molar mass 56 32

As given

equal masses 32 32

of Both

∴

56

32

32

32

0.07 1

limiting Excess

moles of excess regent remains −1−0.57=0.43