Question

A mineral haematite fe2o3 contains unwanted material called gangue in addition to fe2o3. if 5kg of the ore contains 2.78kg of iron what is the percentage purity of fe2o3​

Answer 1

Answer:

The  percentage purity of fe2o3​ is 79.60%

Explanation:

According to the problem 5kg of the ore contains 2.78kg of iron whcih creates some impurities in  fe2o3

Now we have to calculate the amount of fe present in fe2o3 in percentage is=  111.70/159.70 X 100=  69.94%

According to the problem the mass of fe is 2.78kg which means 69.94%

Therefore, the actual mass of fe2o3 is

2.78/69.94 x 100=  3.98 kg

Therefore the percentage purity of fe2o3​ is 3.98/5 x 100 = 79.60%

Answer 2

Answer:

The  percentage purity of fe2o3​ is 79.60%

Explanation:

According to the problem 5kg of the ore contains 2.78kg of iron whcih creates some impurities in  fe2o3

Now we have to calculate the amount of fe present in fe2o3 in percentage is=  111.70/159.70 X 100=  69.94%

According to the problem the mass of fe is 2.78kg which means 69.94%

Therefore, the actual mass of fe2o3 is

2.78/69.94 x 100=  3.98 kg

Therefore the percentage purity of fe2o3​ is 3.98/5 x 100 = 79.60%