Determine the number of moles of gas in 45.0 liters of oxygen at STP.
a) 1.61 moles
b) 2.01 moles
c) 22.5 moles
d) 45.0 moles

The correct answer is b) 2.01 moles

Explanation:

We use the formula PV=nRT. The normal conditions of temperature and pressure are 273K and 1 atm, we use the gas constant = 0, 082 l atm / K mol.

1 atm x 45 l =  n x 0, 082 l atm/K mol  x 273 K

n =1 atm x 45 l /0, 082 l atm/K mol  x 273 K

n= 2, 010184937 mol

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