MT2007WAns

MT2007WAns - Tuesday, February 13th, 2007 ChE102 Mid-Term...

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ChE102 Mid-Term Examination Tuesday, February 13 th , 2007 Question 1. You wish to estimate the mass of carbon dioxide emitted per passenger for a one-way flight from Toronto to London. Assume you are travelling in a Boeing jumbo jet that cruises at 576 mph and there are 409 passengers on board. Fuel is consumed at a rate of 3.5 L·s –1 and 2.6 g of carbon dioxide is produced for every 1 mL of fuel consumed. It is 3 093 nautical miles from Toronto to London. Data: 1 nautical mile = 1.852 km; you also have a table of conversion factors. A. 8 kg B. 202 kg C. 495 kg D. 644 kg E. 5 000 kg Question 2. An unknown element, A, is known to form an oxide with oxygen with the molecular formula AO 2 . A sample of AO 2 is analysed and found to contain 52.6 wt.-% A. What is the unknown element A? A. Cl B. Ar C. F D. S E. Ga Question 3. Cryolite (Na 3 AlF 6 ) is used in the production of aluminium from its ores. It is made by the unbalanced reaction, NaOH + Al 2 O 3 + HF Na 3 AlF 6 + H 2 O What mass (in g) of cryolite can be produced by the complete reaction of 287 g of Al 2 O 3 ? A. 1 182
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MT2007WAns - Tuesday, February 13th, 2007 ChE102 Mid-Term...

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