Calculate the number of moles of air molecules trapped in your flask using the Ideal Gas Law (PV = nRT). Remember to watch your units, and that R = 8.314 J mol-1 K-1 = 0.0821 atm L mol-1 K-1 = 0.0831 bar L mol-1 K-1.
Show your work for the above calculation.
ANSWERED: Number of moles of air molecules?
P= 100.7 kPa
T= 275.85
V=20 mL
Changing units:
V= 20 x 10^-3 L
P= 100.7/100= 0.9938 atm
PV= nRT
PV/RT=n
0.9938x20x10^-3/0.0821x275.85
= 8.776x10^-4 moles= n