1) A process is carried out at constant pressure. Given that 0 > H > E, Select o
ID: 906175 • Letter: 1
Question
1)
A process is carried out at constant pressure. Given that 0 > H > E,
Select one:
A. the system loses heat and expands during the process.
B. the system absorbs heat and contracts during the process.
C. the system absorbs heat and expands during the process.
D. the system loses heat and contracts during the process.
2)
Which of CH4(g), C2H2(g), and CH3OH(l) provides the most energy per gram upon combustion and which provides the least?
CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H° = -890 kJ
2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H° = -2599 kJ
2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(l) H° = -1453 kJ
Select one:
A. C2H2 provides the most energy per gram and CH4 the least.
B. C2H2 provides the most energy per gram and CH3OH the least.
C. CH4 provides the most energy per gram and CH3OH the least.
D. CH4 provides the most energy per gram and C2H2 the least.
3)
When 0.250 mol of CH4(g) reacts with excess Cl2(g) at constant pressure according to the chemical equation shown below, 177 kJ of heat are released. Calculate the value of H for this reaction, as written.
2 CH4(g) + 3 Cl2(g) 2 CHCl3(l) + 3 H2(g) H = ?
Select one:
A. +1420 kJ
B. -708 kJ
C. -1420 kJ
D. +708 kJ
4)
The values of H°f for the three states of benzene are approximately -22 kcal/mol, -11 kcal/mol, and 20kcal/mol. Which is the value for solid benzene?
Select one:
A. -22 kcal/mol
B. 20 kcal/mol
C. -11 kcal/mol
D. cannot be determined without additional information
5.)
The heat of combustion per mole for acetylene, C2H2(g), is -1299.5 kJ/mol. Assuming that the combustion products are CO2(g) and H2O(l), and given that the enthalpy of formation is -393.5 kJ/mol for CO2(g) and -285.8 kJ/mol for H2O(l), find the enthalpy of formation of C2H2(g).
Select one:
A. -620.2 kJ/mol
B. -846.1 kJ/mol
C. +226.7 kJ/mol
D. -226.7 kJ/mol
6)
Which is a measure of the sum of the kinetic and potential energies of each particle in the system?
Select one:
A. T, the temperature
B. H, the enthalpy
C. G, the Gibbs free energy
D. E, the internal energy
7)
Find H for BaCO3 (s) BaO (s)+ CO2 (g)
given 2 Ba (s) + O2 (g) 2 BaO (s) H = -1107.0 kJ
Ba (s) + CO2 (g) + 1/2 O2 (g) BaCO3 (g) H = -822.5 kJ
Select one:
A. -284.5 kJ
B. 269.0 kJ
C. -1929.5 kJ
D. -1376.0 kJ
8)
When 1.50 g of Ba(s) is added to 100.00 g of water in a container open to the atmosphere, the reaction shown below occurs and the temperature of the resulting solution rises from 22.00°C to 33.10°C. If the specific heat of the solution is 4.18J//gC calculate for the reaction, as written.
Ba(s) + 2 H2O(l) Ba(OH)2(aq) + H2(g) H = ?
Select one:
A. 3.14 kJ
B. -431 kJ
C. -3.14 kJ
9)
10.0 g of a metal, initially at 25°C, are placed into 10.0 g of water, initially at 100°C. Which metal will have the highest final temperature? Shown after each metal is its specific heat in J/(g°C).
Select one:
A. aluminum (0.902)
B. copper (0.385)
C. gold (0.129)
D. iron (0.450)
D. 431 kJ
Explanation / Answer
2)Which of CH4(g), C2H2(g), and CH3OH(l) provides the most energy per gram upon combustion and which provides the least?
CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H° = -890 kJ
2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H° = -2599 kJ
2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(l) H° = -1453 kJ
A) C. CH4 provides the most energy per gram and CH3OH the least.
3) When 0.250 mol of CH4(g) reacts with excess Cl2(g) at constant pressure according to the chemical equation shown below, 177 kJ of heat are released. Calculate the value of H for this reaction, as written.
2 CH4(g) + 3 Cl2(g) 2 CHCl3(l) + 3 H2(g) H = ?
A) A. +1420 kJ
4)The values of H°f for the three states of benzene are approximately -22 kcal/mol, -11 kcal/mol, and 20kcal/mol. Which is the value for solid benzene?
A) A. -22 kcal/mol
5.)The heat of combustion per mole for acetylene, C2H2(g), is -1299.5 kJ/mol. Assuming that the combustion products are CO2(g) and H2O(l), and given that the enthalpy of formation is -393.5 kJ/mol for CO2(g) and -285.8 kJ/mol for H2O(l), find the enthalpy of formation of C2H2(g).
A) B. -846.1 kJ/mol
9)10.0 g of a metal, initially at 25°C, are placed into 10.0 g of water, initially at 100°C. Which metal will have the highest final temperature? Shown after each metal is its specific heat in J/(g°C).
A) A. aluminum (0.902).
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