What gas has the greatest density at 25 degree Celsius and 1.00 atm pressure?

a. O2

b. N2

c. H2

d. CO2

e. Xe

Gas A is in a 2-L flask with a pressure of 1 atm at 298 K. Gas B is in a 4-L flask with a pressure of 0.5 atm at 273 K. Which gas is present in greater amounts?

a. A

b. B

c. Neither. The amounts are the same.

Measured at a pressure of 1.0 atm and 298 K, gas C has a density of 2.0 g/L. The density of gas D, measured at a pressure of 0.5 atm and 298 K, is 1.3 g/L. Which gas has the larger molar mass?

a.C

b.D

c. Neither the molar masses are the same

Please explain how you came to the answer

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