A 22cm-diameter cylinder that is 42cm long contains 51g of oxygen gas at 20 degree Celsius?

A 22cm-diameter cylinder that is 42cm long contains 51g of oxygen gas at 20 degree Celsius. (A) How many moles of oxygen are in the cylinder? (B) How many moles of oxygen are in the cylinder? (C) What is the reading of a pressure gauge attached to the tank?

A. n = mass/molecular mass = 51/32 mol
B. Same as A? A question I get to ask myself?
Hmmm, thinking out of the cylinder.
OK, how many moles of oxygen are not in the cylinder (but in the atmosphere)? I’ll make it easy by assuming g is constant over the height of the atmosphere.
Answer: Mass = weight of air/g = 4pi*r(earth)^2*101325/g kg
n = 1000*mass/32 – 51/32
C. Getting serious again.
V = pi*r^2*L = 1.5965574E-2 m^3
P(abs) = nRT/V = 51/32*8.314472*293.15/1.5965574E-2 = 243310 Pa
P(gauge) = 243310-101325 = 141985 Pa

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