the number of molecules in 1 liter of O2 gas at 56 C and 821 torr is?

[Raisa S]

1. 1.83 x 10^25 molecules2. 2.41 x 10^223. 32 molecules4. 2.24 x 10^235. 4 x 10^-2

[bitty.punk]

PV=nRTwhere p is pressure 821 torrvolume = 1LT = 273.15 + 56 (K)R = ideal gas constant look i up and try to use one that has unit Torr in it or conver torr into atm if thats easier 760torr=1atmn= number of molecules of o2rearrange equation to getn= (PV)/(RT)plug in your numbers and solve