Question

WHat is the mass of iron produced when 125g of C0 reacts completely using the following reaction FE2O3(S)+3CO(g)->2 Fe(s)+3 CO2(g)?

Answer 1

166.07 g

Explanation:

First find the number of moles of CO present
`mol=(mass)/(molar mass)`
`mol=125/(12+16)`
`mol=4.46 g/(mol)`

Then use mole ratio to find moles of iron
3 moles of CO= 2 moles of Fe
4.46 moles of CO = `2/3` x 4.46 moles of Fe
Hence Fe = 2.96 moles

then find mass using
`mol=(mass)/(molar mass)`
`mass= mol * molar mass`
`mass= 2.96 * 55.8`
`mass= 166.07 g`

• Molar masses are obtained from SQA Chemistry Data Booklet