A flask with a tap has volume 200cm^3 When full of air, the flask has a mass of 30.98g
The flask is connected to a vacuum pump, the air is pumped out and then the tap is closed. The flask now has a mass if 30.72g

Calculate the mass of the air in the flask before connecting to the vacuum pump, in grams.

Ammonia and oxygen react to form nitrogen monoxide and water, like this: 4nh3 (g) + 5o2 (g) → 4no (g) + 6h2o (g) also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition: compound pressure at equilibrium nh3 65.1atm o2 31.3atm no 62.7atm h2o 65.8atm compound pressure at equilibrium nh3 65.3 atm o2 7.79 atm no 12.1 atm h2o 65.8 atm calculate the value of the equilibrium constant kp for this reaction. round your answer to 2 significant

Which one of the following substances would be the most soluble in ccl4? na2so4 h2o ch3ch2ch2ch2oh c4h10 hi

How many moles of kci are produced from 2.50 moles k