Saved Bookmarks
| 1. |
What volume of oxygen at STP is required to affect complete combustion of 200 cm^(3) of acetylene and what would be the volume of carbon dioxide formed ? |
|
Answer» Solution :The chemical equation representing the combustion of acetylene is : `underset("2 Vol.")(2C_(2)H_(2))+underset("5 Vol.")(5 O_(2))rarr underset("4 Vol.")(4 CO_(2))+2H_(2)O` Step 1. To CALCULATE the volume of `O_(2)` at STP required to after complete combustion of `200 cm^(3)` of acetylene. Applying Gay Lussac's Law of gaseous volumes, 2 Vol. of `C_(2)H_(2)` required `O_(2)` for complete combustion = 5 Vol. `therefore 200 cm^(3)` of `C_(2)H_(5)` will require `O_(2)` for complete combustion `=(5)/(2)xx200=500 cm^(3)` at STP. Thus, the volume of `O_(2)` required at STP. Step 2. To calculate the volume of `CO_(2)` produced at STP. Applying Gay Lussac's Law og faseous volumes, 2 Vol. of `C_(2)H_(2)` produce `CO_(2)=4` Vol. `therefore 200 cm^(3)` of `C_(2)H_(2)` at STP will produce `CO_(2)=(4)/(2)xx200=400 cm^(3)` at STP Thus, the volume of `CO_(2)` produced `= 400 cm^(3)` at STP. |
|