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Chem 103 Exam 2 Rated A+ 100% Solved
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1. Fundamentals & introduction to at... Chemistry 30- Chemical Properties ... Matter & Its Interactions Unit SCIENC
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Density directly related to mass and pressure, inversely related to temperature
When measured under the same set of B. Higher mass=higher density
conditions, which gas is expected to have
the
highest density?
A. O2
B. Xe
C. He
D. They would all be the same
What mass of sodium azide, NaN3, (molar E. 89.3 g
mass =
65.01 g/mol) is required to inflate a 45.5 L
airbag to a
pressure of 828 mmHg at 20.0
oC?
A. 201 g
B. 2.06 g
C. 0.0317 g
D. 132 g
E. 89.3 g
44.0 grams of gas at STP occupies 22.4 L. CO2: molar mass is 44 g and because of STP
The gas could be PV=nRT
A. O2 (1)(22.4)=(.08206)(273.15)n
B. N2 n=1 mole
C. CO2
D.Ar
,What happens to the density of a gas in a C. Pressure and temperature increase by the same ratio
sealed glass flask if the temperature is d=pm/RT
raised?
A. Density will increase.
B. Density will decrease.
C. Density will remain the same
A 1.00 L flask contains a mixture of Ar, N2 C. Ptotal = PAr + PO2 + PN2
and 4.5 = 1 + 1 + PN2
O2. If PTotal = 4.5 atm, and PAr = PO2 = 1.0 PN2 = 2.5
atm, what is PN2?
A. 1.0 atm
B. 1.5 atm
C. 2.5 atm
D. Cannot be determined unless
temperature is given
A 1.00 L flask contains a mixture of Ar, N2, C. Occupies entire flask even when part of a mixture
and O2.
If PTotal = 4.5 atm, and PAr = PO2 = 1.0 atm,
what is the volume occupied by the
oxygen?
A. 0.22 L
B. 0.56 L
C. 1.00 L
D. Cannot be determined unless
temperature is given
Ptotal = PAr + PO2 + PN2
Pgas = (ngas/ntotal) * Ptotal
Gas Mixtures: Key Concepts ngas/ntotal = Xgas, mole fraction
a gas that makes up 21% or .21 of a mixture will contribute 21% of the total pressure
A 1.00 L flask contains a mixture of Ar, N A. PV = nRT
2, and O2. PAr/Ptotal
If PTotal = 4.5 atm, and PAr = PO2 = 1.0 atm, 1.0/4.5
what is the mole fraction of Ar?
A. 0.22
B. 0.56
C. 1.00
D. Cannot be determined unless
temperature is given
If more N2 is introduced into the same flask C. It stays the same
so
that its partial pressure increases to 4.0
atm,
what happens to PO2?
A. It increases
B. It decreases
C. It stays the same
, CH4 and O2 are mixed in a stoichiometric CH4 + 2O2 = CO2 + H2O
ratio in a glass flask, the total pressure in
the
flask is 600 mmHg. What is the partial
pressure
of each gas prior to combustion?
To determine the "stoichiometric ratio",
we need a balanced chemical equation.
What is it?
CH4 and O2 are mixed in a stoichiometric C. 2:1 mole ratio between O2 and CH4 = 600
ratio in a PO2 = 400
glass flask, the total pressure in the flask is PCH4 = 200
600
mmHg. What is the partial pressure of each
gas prior
to combustion?
balanced chemical equation is: CH4 + 2O2
= CO2 + H2O
A. PO2 = 600 mmHg PCH4 = 600 mmHg
B. PO2 = 300 mmHg PCH4 = 300 mmHg
C. PO2 = 400 mmHg PCH4 = 200 mmHg
D. PO2 = 450 mmHg PCH4 = 150 mmHg
The pressure of O2 in a 2.50 L flask is 3.0 A. 2.0 - Pv1=Pv2
atm. When 3*2.5 = 1.5 P
the stopcock connecting the flask to an P= 2
empty 1.5 L
flask is opened, what will be the pressure
of O2?
A. 2.0 atm
B. 1.0 atm
C. 1.3 atm
D. 3.0 atm
The pressure of O2 in a 2.50 L flask is 3.0 A. because no matter what the pressure remains the same it isn't just sectioned off in
atm. The one area
pressure of N2 in a 1.25 L flask is 1.00 atm.
When
the stopcock connecting the two flasks
together is
opened, what is the partial pressure of O2?
A. 2.0 atm
B. 1.0 atm
C. 1.3 atm
D. 3.0 atm
moles of solute/liter of solution
molarity
Units: mol/L or M (molar)
Chem 103 Exam 2 Rated A+ 100% Solved
Correctly Brand New!!
Save
Students also studied
1. Fundamentals & introduction to at... Chemistry 30- Chemical Properties ... Matter & Its Interactions Unit SCIENC
Teacher 20 terms Teacher 11 terms Teacher 50 terms 20 terms
adam_00100 Preview Vivi_Pius Preview a111111111111111124 Preview Exis
Density directly related to mass and pressure, inversely related to temperature
When measured under the same set of B. Higher mass=higher density
conditions, which gas is expected to have
the
highest density?
A. O2
B. Xe
C. He
D. They would all be the same
What mass of sodium azide, NaN3, (molar E. 89.3 g
mass =
65.01 g/mol) is required to inflate a 45.5 L
airbag to a
pressure of 828 mmHg at 20.0
oC?
A. 201 g
B. 2.06 g
C. 0.0317 g
D. 132 g
E. 89.3 g
44.0 grams of gas at STP occupies 22.4 L. CO2: molar mass is 44 g and because of STP
The gas could be PV=nRT
A. O2 (1)(22.4)=(.08206)(273.15)n
B. N2 n=1 mole
C. CO2
D.Ar
,What happens to the density of a gas in a C. Pressure and temperature increase by the same ratio
sealed glass flask if the temperature is d=pm/RT
raised?
A. Density will increase.
B. Density will decrease.
C. Density will remain the same
A 1.00 L flask contains a mixture of Ar, N2 C. Ptotal = PAr + PO2 + PN2
and 4.5 = 1 + 1 + PN2
O2. If PTotal = 4.5 atm, and PAr = PO2 = 1.0 PN2 = 2.5
atm, what is PN2?
A. 1.0 atm
B. 1.5 atm
C. 2.5 atm
D. Cannot be determined unless
temperature is given
A 1.00 L flask contains a mixture of Ar, N2, C. Occupies entire flask even when part of a mixture
and O2.
If PTotal = 4.5 atm, and PAr = PO2 = 1.0 atm,
what is the volume occupied by the
oxygen?
A. 0.22 L
B. 0.56 L
C. 1.00 L
D. Cannot be determined unless
temperature is given
Ptotal = PAr + PO2 + PN2
Pgas = (ngas/ntotal) * Ptotal
Gas Mixtures: Key Concepts ngas/ntotal = Xgas, mole fraction
a gas that makes up 21% or .21 of a mixture will contribute 21% of the total pressure
A 1.00 L flask contains a mixture of Ar, N A. PV = nRT
2, and O2. PAr/Ptotal
If PTotal = 4.5 atm, and PAr = PO2 = 1.0 atm, 1.0/4.5
what is the mole fraction of Ar?
A. 0.22
B. 0.56
C. 1.00
D. Cannot be determined unless
temperature is given
If more N2 is introduced into the same flask C. It stays the same
so
that its partial pressure increases to 4.0
atm,
what happens to PO2?
A. It increases
B. It decreases
C. It stays the same
, CH4 and O2 are mixed in a stoichiometric CH4 + 2O2 = CO2 + H2O
ratio in a glass flask, the total pressure in
the
flask is 600 mmHg. What is the partial
pressure
of each gas prior to combustion?
To determine the "stoichiometric ratio",
we need a balanced chemical equation.
What is it?
CH4 and O2 are mixed in a stoichiometric C. 2:1 mole ratio between O2 and CH4 = 600
ratio in a PO2 = 400
glass flask, the total pressure in the flask is PCH4 = 200
600
mmHg. What is the partial pressure of each
gas prior
to combustion?
balanced chemical equation is: CH4 + 2O2
= CO2 + H2O
A. PO2 = 600 mmHg PCH4 = 600 mmHg
B. PO2 = 300 mmHg PCH4 = 300 mmHg
C. PO2 = 400 mmHg PCH4 = 200 mmHg
D. PO2 = 450 mmHg PCH4 = 150 mmHg
The pressure of O2 in a 2.50 L flask is 3.0 A. 2.0 - Pv1=Pv2
atm. When 3*2.5 = 1.5 P
the stopcock connecting the flask to an P= 2
empty 1.5 L
flask is opened, what will be the pressure
of O2?
A. 2.0 atm
B. 1.0 atm
C. 1.3 atm
D. 3.0 atm
The pressure of O2 in a 2.50 L flask is 3.0 A. because no matter what the pressure remains the same it isn't just sectioned off in
atm. The one area
pressure of N2 in a 1.25 L flask is 1.00 atm.
When
the stopcock connecting the two flasks
together is
opened, what is the partial pressure of O2?
A. 2.0 atm
B. 1.0 atm
C. 1.3 atm
D. 3.0 atm
moles of solute/liter of solution
molarity
Units: mol/L or M (molar)
