Chemistry check you!
1. the partial pressure of oxygen at 310 k in one lung (3.0 l) is 21.3 kpa. how many moles of oxygen are in that lung?
0.025
2. you collect hydrogen gas over water at 323 k. the partial pressure of hydrogen is 122.4, and the total pressure is 134.7 kpa. what is the pressure of the water vapor?
12.3 kpa
3. trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. if a tank of trimix 10/50 has a total pressure of 2.07 _ 104 kpa, then what is the partial pressure of oxygen?
2.07 * 103 kpa

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.

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.