need help with some chemistry problems.?

Question

1. Which gas occupies the smallest volume.

1)Gas A: 2 moles at 101.3 kpa and 273 K
2)Gas B: 1 mole at 56.5 kpa and 273 K
3) Gas C: 1 mole at 101.3 kpa and 273K
4) Gas D: 2 moles at 101.3 kpa and 546 K

How would you find out which one occupies the smallest volume

2.The volume of a confined gas can be reduced by the application of pressure at constant temperature. The change in volumemay be explained by the fact the gaseous molecules...

1) take up space
2) are in constant motion
3)collide without loss of energy
4)have varying masses
5) are relatively far apart

3. When a sample of oxygen gas in a closed container of a constant volume is heated untill it's absolute temperature is douled, which of the following is also doubled..

1) the density of the gas
2) the pressure of the gas
3) the acceleration of the gas molecules
4)the number of molecules

Answer 1

Use PV=nRT. It will solve all of your problems.

Answer 2

1. From pv= nRT.
2 moles would occupy twice the volume as 1 mole at the same PT
1 mole would occupy twice the volume at 1/2 atm than 1 atm at the same T
2 moles would occupy four times the volume of 1 mole at twice the abs. temperature and 1 atm
Answer is c

2. (2)
3. (2). See prob 1.