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

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?
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
?