How many atoms are in a 2.6 mole sample of argon gas at STP? 1.57 x 10^24
2.6 x 10^23
6.022 x 10^23
3.0 x 10^23

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88

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At 20°c, a sample of h2o liquid and a sample of co2 gas each have the same average kinetic energy. why is one a liquid and the other a gas at this temperature?