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QUESTION 5
5.1
Sulphur reacts with iron according to the equation:
Fe +S → FeS
The reaction requires large amount of heat
When 2,5g sulphur and 5 g iron were placed in a test tube and heated strongly, a
reaction took place to produce a greyish black solid. After the reaction was completed
the solid was found to be magnetic.
5.1.1 Why was this greyish black solid magnetic?
5.1.2 Calculate the mass of Fos produced​

Answer 1

The black solid is magnetic due to the special property of iron called ferromagnetism

6.9 g

Step-by-step explanation:

The substance FeS is magnetic despite of the fact Fe^2+ is spin paired due to the special magnetic property of iron called ferromagnetism.

The equation of the reaction is;

Fe(s) + S(s) ----> FeS(s)

Number of moles of Fe = 5g/56g/mol = 0.089 moles

Since the reaction is 1:1, 0.089 moles of FeS is formed

For Sulphur;

Number of moles of sulphur = 2.5g/32 g/mol = 0.078 moles

Since the reaction is 1:1, 0.078 moles of FeS is formed

Hence sulphur is the limiting reactant.

So, mass of FeS produced = 0.078 × 87.91 g/mol = 6.9 g