EXAM 3 GEN CHEM I (QUIZ) WITH |\ |\ |\ |\ |\ |\ |\
ANSWERS
Which of the following signs on q and w represent the surroundings
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
that is doing work on the system, as well as losing heat to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
surroundings?
q = +, w = -
|\ |\ |\ |\ |\
q = -, w = +
|\ |\ |\ |\ |\
q = +, w = +
|\ |\ |\ |\ |\
q = -, w = -
|\ |\ |\ |\ |\
None of these represent the system referenced above. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔q = -, w = + |\ |\ |\ |\ |\ |\
A 6.55 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
was combusted in a bomb calorimeter. If the temperature rose by
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
32.9°C, use the information below to determine the heat capacity of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the calorimeter.
|\
4 C6H5NH2(l) + 35 O2(g) → 24 CO2(g) + 14 H2O(g) + 4 NO2(g)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ΔH°rxn = -1.28 × 104 kJ - CORRECT ANSWERS ✔✔6.84 kJ/°C
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
calorimeter, according to the following reaction. If the temperature |\ |\ |\ |\ |\ |\ |\ |\ |\
, rises from 25.0 to 62.3°C, determine the heat capacity of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
calorimeter. The molar mass of ethanol is 46.07 g/mol. |\ |\ |\ |\ |\ |\ |\ |\
C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(g) |\ |\ |\ |\ |\ |\ |\ |\ |\
ΔH°rxn = -1235 kJ - CORRECT ANSWERS ✔✔15.7 kJ/°C
|\ |\ |\ |\ |\ |\ |\ |\
Which statement is FALSE? |\ |\ |\
ΔHrxn is the heat of reaction. |\ |\ |\ |\ |\
ΔErxn is a measure of the total energy change.
|\ |\ |\ |\ |\ |\ |\ |\
An endothermic reaction gives off heat to the surroundings.
|\ |\ |\ |\ |\ |\ |\ |\
Enthalpy is the sum of a system's internal energy and the product of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pressure and volume.
|\ |\ |\
Endothermic has a positive ΔH - CORRECT ANSWERS ✔✔An |\ |\ |\ |\ |\ |\ |\ |\ |\
endothermic reaction gives off heat to the surroundings. |\ |\ |\ |\ |\ |\ |\
Using the following equation for the combustion of octane, calculate
|\ |\ |\ |\ |\ |\ |\ |\ |\
the heat associated with the combustion of 150.0 g of octane
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
assuming complete combustion. The molar mass of octane is 114.33
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
g/mole. The molar mass of oxygen is 31.9988 g/mole.
|\ |\ |\ |\ |\ |\ |\ |\
2 C8H18 + 25 O2 → 16 CO2 + 18 H2O
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ΔH°rxn = -11018 kJ - CORRECT ANSWERS ✔✔-7228 kJ
|\ |\ |\ |\ |\ |\ |\ |\
According to the following reaction, how much energy is evolved
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
during the reaction of 2.50 L B2H6 and 5.65 L Cl2? (Both gases are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS
Which of the following signs on q and w represent the surroundings
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
that is doing work on the system, as well as losing heat to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
surroundings?
q = +, w = -
|\ |\ |\ |\ |\
q = -, w = +
|\ |\ |\ |\ |\
q = +, w = +
|\ |\ |\ |\ |\
q = -, w = -
|\ |\ |\ |\ |\
None of these represent the system referenced above. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔q = -, w = + |\ |\ |\ |\ |\ |\
A 6.55 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
was combusted in a bomb calorimeter. If the temperature rose by
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
32.9°C, use the information below to determine the heat capacity of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the calorimeter.
|\
4 C6H5NH2(l) + 35 O2(g) → 24 CO2(g) + 14 H2O(g) + 4 NO2(g)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ΔH°rxn = -1.28 × 104 kJ - CORRECT ANSWERS ✔✔6.84 kJ/°C
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
calorimeter, according to the following reaction. If the temperature |\ |\ |\ |\ |\ |\ |\ |\ |\
, rises from 25.0 to 62.3°C, determine the heat capacity of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
calorimeter. The molar mass of ethanol is 46.07 g/mol. |\ |\ |\ |\ |\ |\ |\ |\
C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(g) |\ |\ |\ |\ |\ |\ |\ |\ |\
ΔH°rxn = -1235 kJ - CORRECT ANSWERS ✔✔15.7 kJ/°C
|\ |\ |\ |\ |\ |\ |\ |\
Which statement is FALSE? |\ |\ |\
ΔHrxn is the heat of reaction. |\ |\ |\ |\ |\
ΔErxn is a measure of the total energy change.
|\ |\ |\ |\ |\ |\ |\ |\
An endothermic reaction gives off heat to the surroundings.
|\ |\ |\ |\ |\ |\ |\ |\
Enthalpy is the sum of a system's internal energy and the product of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pressure and volume.
|\ |\ |\
Endothermic has a positive ΔH - CORRECT ANSWERS ✔✔An |\ |\ |\ |\ |\ |\ |\ |\ |\
endothermic reaction gives off heat to the surroundings. |\ |\ |\ |\ |\ |\ |\
Using the following equation for the combustion of octane, calculate
|\ |\ |\ |\ |\ |\ |\ |\ |\
the heat associated with the combustion of 150.0 g of octane
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
assuming complete combustion. The molar mass of octane is 114.33
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
g/mole. The molar mass of oxygen is 31.9988 g/mole.
|\ |\ |\ |\ |\ |\ |\ |\
2 C8H18 + 25 O2 → 16 CO2 + 18 H2O
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ΔH°rxn = -11018 kJ - CORRECT ANSWERS ✔✔-7228 kJ
|\ |\ |\ |\ |\ |\ |\ |\
According to the following reaction, how much energy is evolved
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
during the reaction of 2.50 L B2H6 and 5.65 L Cl2? (Both gases are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
