00:01
Hi, so to solve for this we are to arrange the given set of gases in order of increasing density at stp and remember that the formula for density for an ideal gas is pressure multiplied by the molar mass of the gas m divided by r, the gas constant and t, the temperature.
00:24
So we know that the gases here have the same pressure and temperature at stp and r is also a constant so that means the only difference will be the value of the molar mass of the gases and since density is directly proportional to the molar mass of the gas that means the higher the molar mass the higher the density and the lower the molar mass the lower the density.
00:54
So we just need to calculate the molar mass of these gases.
00:57
We don't have to calculate their density at stp in order to arrange this set of elements.
01:04
So for n2, the molar mass of n2 is 14 .01 from the predict table multiplied by 2.
01:12
This will give us 28 .02 grams per mole.
01:15
And then we have nh3, atomic mass of nitrogen 14 .01 plus 1 .01 multiplied by 3.
01:25
This will give us 17 .04 grams per mole.
01:30
And then for oxygen gas, that's 32 grams or atomic mass of oxygen 16 multiplied by 2...