Consider a sealed can that is filled with refrigerant-134a. the contents of the can are at the room temperature of 25°c. now a leak develops, and the pressure in the can drops to the local atmospheric pressure of 100 kpa. the temperature of the refrigerant in the can is expected to drop to (rounded to the nearest integer) (a) o°c (b) -26°c (4) -18°c (d) 3°c (el25°c

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

What layer of the atmosphere is directly above the troposphere?

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?