blackratpoo
Member
- Joined
- Aug 22, 2008
- Messages
- 272
- Gender
- Female
- HSC
- 2010
does anyone have 2009 independent solutions?
Q.20 HELP (a), (b) & (c).
'One suggested measure to remove carbon dioxide from the atmosphere is to construct 'artificial trees' in which air passes through slats wet with dilute sodium hydroxide solution. The descending solution of sodium carbonate and water is collected and mixed with calcium hydroxide, precipitating calcium carbonate and regenerating sodium hydroxide for reuse. Calcium carbonate is separated and heated to recover the carbon dioxide, for burial, and the calcium oxide recycled.'
(a) Construct equations for the reaction of carbon dioxide with sodium hydroxide and the precipitation of calcium carbonate. [2 MARKS]
(b) The atmospheric concentration of carbon dioxide is currently 380 ppm (0.038%) by volume. Determine the volume of air, at 298.15K and 100 kPa, which must pass through an 'artificial tree' to deposit 1000kg of calcium carbonate. (Assume complete absorption of carbon dioxide.) [2MARKS]
(c) The main energy input in the above process is to decompose calcium carbonate, requiring 180 kJ mol-1. If the heat of combustion of natural gas is 1000 kJ mol-1, determine the necessary volume of gas, at 298K and 100 kPa, needed to provide the heat to decompose 1000kg of calcium carbonate. [2MARKS]
Thankyou if you can be bothered replying. :wave:
Q.20 HELP (a), (b) & (c).
'One suggested measure to remove carbon dioxide from the atmosphere is to construct 'artificial trees' in which air passes through slats wet with dilute sodium hydroxide solution. The descending solution of sodium carbonate and water is collected and mixed with calcium hydroxide, precipitating calcium carbonate and regenerating sodium hydroxide for reuse. Calcium carbonate is separated and heated to recover the carbon dioxide, for burial, and the calcium oxide recycled.'
(a) Construct equations for the reaction of carbon dioxide with sodium hydroxide and the precipitation of calcium carbonate. [2 MARKS]
(b) The atmospheric concentration of carbon dioxide is currently 380 ppm (0.038%) by volume. Determine the volume of air, at 298.15K and 100 kPa, which must pass through an 'artificial tree' to deposit 1000kg of calcium carbonate. (Assume complete absorption of carbon dioxide.) [2MARKS]
(c) The main energy input in the above process is to decompose calcium carbonate, requiring 180 kJ mol-1. If the heat of combustion of natural gas is 1000 kJ mol-1, determine the necessary volume of gas, at 298K and 100 kPa, needed to provide the heat to decompose 1000kg of calcium carbonate. [2MARKS]
Thankyou if you can be bothered replying. :wave:
