00:01
Hi, so to solve for this, the volume, temperature, and pressure at stp or standard temperature and pressure, i'm going to write first here, temperature is equivalent to 273 kelvin.
00:15
If you want to be exact, you could use 273 .15, but we're just going to use the whole number here since 0 .15 is negligible and pressure is 180 m.
00:26
So these are the values of temperature and pressure at stp.
00:30
Now we have to solve first for the number of moles of h2 using the ideal gas equation, pv is equivalent to nrt.
00:40
So rearranging this to solve for the number of moles of o2, we'll have pv over rt.
00:46
Now the pressure is 180 m, volume is 12 .2 liters, the ideal gas constant is 0 .0821 liters, 80 m per mole kelvin, and it would be better if you could memorize this constant because it's not usually given in problems like this.
01:05
Temperature, 273 kelvin, now we'll cancel some units, 80 m in liters in kelvin, and then we have here moles, our remaining units...