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
?
This
preview
has intentionally blurred sections.
Sign up to view the full version.

This is the end of the preview.
Sign up
to
access the rest of the document.
- Spring '08
- SIMON
- Chemistry, pH, °C, ChE102 Mid-Term Examination
-
Click to edit the document details