kittyful
Member
- Joined
- Oct 2, 2009
- Messages
- 153
- Gender
- Female
- HSC
- 2011
Another few questions i got stuck on, any help would be appreciated 
1. A silver coin was analysed and found to contain only silver and copper. 1.580g of this coin was dissolved in concentrated nitric acid and the resultant soultion diltued. Reaction of the solution with excess hydrochloric acid yielded 1.050g of silver chloride. Calculate the percentage of silver in the sample ?
Answer: 50.0%
2. A sample of iron wire reacts with oxygen to form iron (III) oxide. If 3.58g of the wire yields 5.00g of the iron (III) oxide, calculate the percentage purity of iron.
Answer 97.7%
3. THe smelting process of chalcopyrite, 2CuFeS2 + 5O2 = 2Cu + 2FeO + 4SO2
If 22.0kg of the chalcopyrite reacts and the percentage yield for this process is 95% calculate the mass of copper formed.
answer: 7.2kg
1. A silver coin was analysed and found to contain only silver and copper. 1.580g of this coin was dissolved in concentrated nitric acid and the resultant soultion diltued. Reaction of the solution with excess hydrochloric acid yielded 1.050g of silver chloride. Calculate the percentage of silver in the sample ?
Answer: 50.0%
2. A sample of iron wire reacts with oxygen to form iron (III) oxide. If 3.58g of the wire yields 5.00g of the iron (III) oxide, calculate the percentage purity of iron.
Answer 97.7%
3. THe smelting process of chalcopyrite, 2CuFeS2 + 5O2 = 2Cu + 2FeO + 4SO2
If 22.0kg of the chalcopyrite reacts and the percentage yield for this process is 95% calculate the mass of copper formed.
answer: 7.2kg