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Girish Toofany
 Chem121/120 20083 Surrey Le
1
Assignment 1.
Due date: Sat Sep 13 23:59:00 2008
1 point(s)
Calculators and ScientiFc Notation
Use a calculator to evaluate
√
6
.
72
×
10

19
.
You are correct.
Your receipt is 1673577
1 point(s)
SigniFcant ±igures in Simple Calculations
Evaluate the following expression and express the answer in
decimal
or
scientiFc
notation
rounded
to the correct num
ber of
signiFcant
Fgures
.
2.40 x 1.7 =
You are correct.
Your receipt is 167402
1 point(s)
Units and SigniFcant ±igures
Evaluate the following expression and express the answer
in
scientiFc
notation
rounded
to the correct number of
signiFcant
Fgures
.
Also specify correct
units
.
0
.
00421
g
[0
.
0007840
cm
3
+1
.
19
×
10

5
cm
3
]
=
You are correct.
Your receipt is 1679908
2 point(s)
Dimensional Analysis and Units
A Canadian, driving in the U.S.A., fuels their car at a cost
of
US
$
3.73 per gallon (US)
.
The current monetary exchange rate is
0.942 US
$/
Can
$.
The density of the fuel is
0.614 g/mL
.
What is the mass of
Can
$
60.00
worth of this fuel?
You are correct.
Your receipt is 1678732
If the vehicle consumes the gasoline at a rate of
7.18 L/100
km
, how many
miles
can it travel on the above amount of
gasoline?
miles
You are correct.
Your receipt is 1671000
1 point(s)
Mass–Density–Volume–Displacement
Canadian $0.10 and $0.25 coins are made of pure nickel
which has a density of 8.902 g/cm
3
.
Suppose each dime
weighs 2.02 g and each quarter weighs 5.05 g.
A small
collection of dimes and quarters are submerged in 10.00 mL
of water in a graduated cylinder causing the water level to
rise to the 17.83 mL mark. What is the combined monetary
value (in Can$) of those coins?
$
Incorrect.
3 point(s)
Molar Mass and Elemental Composition
Current convention deFnes 1 amu as exactly
1
12
the mass of
an atom of the isotope
12
C. Since most elements occur natu
rally in wellestablished Fxed relative abundances of di±erent
isotopes, the socalled
Atomic Mass
for a particular element
represents a weighted average of the masses of the individual
isotopes. ²or example, naturally occuring carbon is a mixture
of 98.90%
12
C (12.000000 amu) and 1.10%
13
C (13.003355
amu) plus a trace of
14
C (14.003241 amu). The
Atomic Mass
of carbon is found to be 12.011 amu.
A
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 Spring '09
 PEGGY
 Chemistry

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