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

P = pressure, atm

V = volume, L

n = moles, mol

R = gas constant = 0.08206 (L·atm)/(mol·K)

T = temperature, K

Assume that a single cylinder of an automobile engine has a volume of 525 cm^{3} .

If the cylinder is full of air at 75 ^{o}C and 0.990 atm , how many moles of O_{2} are present? (The mole fraction of O_{2} in dry air is 0.2095.)

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