Gases Chemistry Worksheet - Chapter 13, An Introduction To Chemistry Page 26

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508
Chapter 13
Gases
For solutions, molarity can be used to convert from moles to volume of
solution.
(coefficient 2) mol 2
1 L solution 2
(coefficient 1) mol 1
(number from molarity) mol 2
3
(coefficient 2) mol 2
10
mL solution 2
or
(coefficient 1) mol 1
(number from molarity) mol 2
For a gas at STP, the molar volume at STP can be used as a conversion factor to
O
19
bjeCtive
convert from moles to volume of gas at STP.
(coefficient 2) mol 2
22.414 L 2
(coefficient 1) mol 1
1 mol 2
For a gas under conditions other than STP, the ideal gas equation or the universal
O
19
bjeCtive
gas constant, R, can be used to convert from moles to volume of gas.
n
RT
2
2
V
=
2
P
2
K
(coefficient 2) mol 2
0.082058 L atm
or
atm
(coefficient 1) mol 1
K mol
K
(coefficient 2) mol 2
8.3145 L kPa
or
kPa
(coefficient 1) mol 1
K mol
e
See Examples 13.5, 13.6, 13.7, and 13.8.
xampleS
Figure 13.10
Summary of Equation Stoichiometry Possibilities
Start here when
Mass substance 2
Mass substance 1
mass is given.
Start here when volume
Molar mass 2
of solution is given.
Volume of solution 2
Volume of solution 1
Molar mass 1
Molarity 2
Molarity 1
(coeffficient 2) mol 2
Can be converted
into mass, into
(coeffficient 1) mol 1
moles 2
moles 1
volume of solution,
is is the core of any
or into volume of
equation stoichiometry
gas
R as a conversion
problem.
nRT
factor
R as a conversion
PV
or V =
or n =
P
factor
RT
Volume of gas 1
Volume of gas 2
Start here when volume
at P
& T
at P
& T
of gas is given.
1
1
2
2

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