1. Which condition leads to an increase in the internal energy of a system? -10
ID: 1464246 • Letter: 1
Question
1. Which condition leads to an increase in the internal energy of a system?
-10 J of heat are released by the system, and 3 J of work are done on the system.
-6 J of heat are released by the system, and -3 J of work are done by the system.
6 J of heat are gained by the system, and- 3 J of work are done by the system.
3 J of heat are gained by the system, and -6 J of work are done by the system.
-6 J of heat are released by the system, and 3 J of work are done by the surroundings.
3. The value of DH° for the reaction below is -186 kJ.
2 HCl (g) à H2 (g) + Cl2 (g)
The value for DH°f (kJ/mol) of HCl (g) is _______.
a. +186 b. -3.72 x 102 c. -93.0 d. -1.27 x 102 e. -186 f. +93.0
4. In order to ensure that comparisons of changes in enthalpy for reactions can be made, measurements of changes in enthalpy must be made under the conditions of:
298 K, 1 atm pressure, and 1 M concentration.
273 K, 1 atm pressure, 1 M concentration, and specified physical states.
298 K, 1 atm pressure, 1 M concentration for ions, and specified physical states.
25°C, 1 atm pressure, 1 M concentration, and specified physical states.
273 K, 1 atm pressure, and 1 M concentration.
Explanation / Answer
1) 6 J of heat are gained by the system, and- 3 J of work are done by the system.
2) f. +93.0
3)25°C, 1 atm pressure, 1 M concentration, and specified physical states.
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