What is the molality of a solution that has 4 mol of kci in 0.800 kg of water

Hydrogen has three isotopes 1h, 2h, and 3h. what is the difference between these three isotopes?

Amole, which is a unit in chemistry, contains 6.02 x 1023 atoms or particles. how many zeroes follow the 2 when this number is written out in standard form? a) 21 b) 23 c) 24 d) 25

With carbon dioxide what phase change take place when the temperature decreases from -40c to -80c at 2 atm