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* General Chemistry, 5th Edition
* Gen Chem 1 EVE: Tues. Evening Taught by Ronald Petruso
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Self Assessment B
This assignment is due on April 15 2010, 11:30 PM EDT.
An endothermic process
A) raises the temperature of one gram of a substance by one degree Celcius.
B) takes in heat from the surroundings.
C) increases the acidity of the surroundings.
D) gives off heat to the surroundings.
E) releases carbon dioxide into the surroundings.
The chemical equation describing the conversion of SO2 into SO3 is shown below. Calculate DHo when 89.6 g of SO2 is converted into SO 3.
SO2(g) + ½O2(g) ----> SO3(g) DHorxn = -99.1 kJ
A) -69.3 kJ
B) -139 kJ
C) 69.3 kJ
D) 139 kJ
E) -111 kJ
How much energy in calories is required to heat 25.0 g of platinum (specific heat capacity = 0.032 cal/g.K) from 24.5 oC to 75.0 oC?
A) 48 cal
B) 20. cal
C) 80 cal
D) 40. cal
E) None of the above.
If a substance has a specific heat capacity of 1.0 J/g·oC and a density of 2.0 g/mL, how much energy would be required to raise the temperature of 100 mL of the substance from 25 to 45 oC?
A) 0.20 kJ
B) 2.0 kJ
C) 4 kJ
D) 8 kJ
A 0.468-g sample of pentane (C5H12) was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.00 kg of water rose from 20.45 to 23.65 oC. The specific heat capacity of the calorimeter is 2.21 kJ/ oC, and the specific heat capacity of water is 4.184 J/g·oC. What is the heat of combustion of one mole of C5 H12?
A) -7.07 x 103 kJ/mol
B) -2.05 kJ/mol
C) -3.16 x 103kJ/mol
D) 1.34 x 104 kJ/mol
E) 3.16 x 103 kJ/mol
Calculate the standard heat of formation of carbon disulfide (CS2) from its elements, C(s) + 2 S(s) ----> CS2(l), given that:
C(s) + O2(g) ----> CO2(g), DH = -393.5 kJ;
S(s) + O2(g) ----> SO2(g), DH = -296.8 kJ; and
CS2(l) + 3 O2(g) ----> CO2(g) + 2 SO2(g), DH = -1076.8 kJ.
A) -1767.1 kJ
B) -386.5 kJ
C) 89.7 kJ
D) 386.5 kJ
E) None of the above
For which of the substances below is DHof = 0?
E) A and B
To which of the following reactions occurring a 25 oC does the symbol DHof [H2O(l)] apply?
A) H2O(l) ----> 2 H(g) + O(g)
B) 2 H(g) + O(g) ----> H2O(l)
C) H2(l) + ½O2(l) ----> H2O(l)
D) H2(g) + ½O2(g) ----> H2O(l)
E) H2O(g) ----> H2O(l)
The heat of solution of KCl is 17.2 kJ/mol, and the combined heats of hydration of one mole of gaseous chloride ions and one mole of gaseous potassium ions is -698 kJ. What is the lattice energy of potassium chloride?
A) -681 kJ/mol
B) 715 kJ/mol
C) -715 kJ/mol
D) -332 kJ/mol
E) 681 kJ/mol
A certain gas expands in volume from 2.0 L to 24.5 L at constant temperature. Calculate the work done by the gas if it expands against a constant pressure of 5 atm.
A) -112.5 J
B) 1.24 x 104 J
C) -1.14 x 104 J
D) 113 J
E) 1.14 x 104 J
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