Transcript Gas Stoichiometry

Gas Stoichiometry
Non-Standard Conditions
Nonstandard Conditions
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Gas volume changes dramatically
when pressure or temperature change.
Key: The mole-mol calculation must
take place at STP.
Doing the Calculations
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Given a volume of gas at other than
STP?
– Convert to STP before doing the molemole calculation.
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Finding the volume of gas at other
than STP?
– Do the mole-mole step, then convert the
volume to stated conditions
Problem 1
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What volume of chlorine gas measured
at 18.5oC and 98.0 kPa can be
produced by the electrolysis if 62.3 g
of NaCl to give sodium metal and
chlorine gas?
Answer: 13.2 L
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A.
B.
C.
D.
E.
Problem
2.00 g of sucrose is combusted in excess oxygen. What
is the volume of dry CO2 that is formed at 1 atm
pressure and 37oC?
MW sucrose = 342.3 g/mol
C12H22O11 + 12O2  12CO2 + 11H2O
22.4 L
10.4 L
1.78 L
0.545 L
0.148 L
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A.
B.
C.
D.
E.
Problem
2.00 g of sucrose is combusted in excess oxygen. What
is the volume of dry CO2 that is formed at 1 atm
pressure and 37oC?
MW sucrose = 342.3 g/mol
C12H22O11 + 12O2  12CO2 + 11H2O
22.4 L
10.4 L
1.78 L
0.545 L
0.148 L