# Problem: Assume that a single cylinder of an automobile engine has a volume of 525 cm3 .If the cylinder is full of air at 75 oC and 0.990 atm , how many moles of O2 are present? (The mole fraction of O2 in dry air is 0.2095.)

###### FREE Expert Solution

$\overline{){\mathbf{PV}}{\mathbf{=}}{\mathbf{nRT}}}$

P = pressure, atm
V = volume, L
n = moles, mol
R = gas constant = 0.08206 (L·atm)/(mol·K)
T = temperature, K

###### Problem Details

Assume that a single cylinder of an automobile engine has a volume of 525 cm3 .

If the cylinder is full of air at 75 oC and 0.990 atm , how many moles of O2 are present? (The mole fraction of O2 in dry air is 0.2095.)