PAST PAPER December 2016 3. You detected a high concentration of methane, which
ID: 545355 • Letter: P
Question
PAST PAPER December 2016 3. You detected a high concentration of methane, which is produced from anaerobic decomposition of organic matter at the landfill. Methane is a greenhouse gas that leads to global warming therefore the manager of the landfill wants to collect the methane to use as a fuel, instead of releasing it into the environment. (a) The production of methane from organic material can summarized in the equation below CH:0 CO2 + CH4 Rewrite the equation in your booklet and balance the above equation 12 marks] (i) The collection of methane would only be profitable if 500OL at atmospheric temperature and pressure of 25 C and 1 atm respectively is collected on a monthly basis. What mass of methane does this represent? 18 marks) (ii) What mass of organic matter would be required to produce this amount of [6 marks) methane on a monthly basis? Write out your answers on folder pages, staple them together and submit them at the end of the lecture session on Tuesday 24th October 2017. Make a copy, it's your tutorial passport. Answer ALL questions as this tutorial may be gradedExplanation / Answer
the reaction i which is balanced is 2CH2O -------->CO2+CH4
moles of methane required need to be calculated (n). Given V= 5000L, T= 25+273= 298K, P=1atm, R=0.0821 L.atm/mole.K
n= PV/RT= 1*5000/(0.0821*298) per month of CH4 has to be produced
moles of methane= 204.4 moles, mass of methane produced =moles* molar mass of methane= 204.4*16=3270.4 gm per month
from the balanced reaction, 1 mole of methane requires 2 moles of CH2O
204.4 moles of methane required 204.4*2= 408.8 moles of CH2O per month
molar mass of CH2O= 12+2+16= 30
mass of CH2O= moles* molar mass =408.8*30 gm=12264 gm
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