Cesium 2013

Chem Hw:
10.20
A sample of gas occupies a volume of 1248 ft³ at 0.988 atm and 28.0ºC. (a) Calculate the pressure of the gas if the volume is decreased to 978 ft³ while its temperature is held constant. (b) At what temperature in degrees Celsius is the volume of the gas at 1435 ft³ if the pressure is kept constant?
10.21
(a) How is the law of combining volumes explained by Avogadro's hypothesis? (b) Consider a 1.0-L flask containing neon gas and a 1.5-L flask containing xenon gas. Both gases are at the same pressure and temperature. According to Avogadro's law, what can be said about the ratio of the number of atoms in the two flasks?
10.22
Nitrogen and hydrogen gases react to form ammonia gas as follows:
N₂(g) + 3H₂(g) -> 2NH₃ (g)
At a certain temperature and pressure, 1.2 L of N₂ reacts with 3.6 L of H₂. If all the N₂ and H₂ are consumed, what volume of NH₃ at the same temperature and pressure will be produced?
10.28
For an ideal gas, calculate the following quantities: (a) the pressure of the gas if 0.215 mol occupies 338 mL at 32ºC; (b) the temperature (in kelvins) at which 0.0412 mol occupies 3.00 L at 1.05 atm; (c) the number of moles in 98.5 L at 236 K and 690 torr; (d) the volume occupied by 5.48 x 10^-3 mol at 55ºC and a pressure of 3.87 kPa.