The original volume of the gas would be 17.45 L.
For an ideal gas:
PV = nRT, where P = pressure, V= volume, n = number of moles, T=temperature, and R = constant = 8.317 l•kpa/mol•k
In this case, n = 0.500 mole, T = 273K, P = 65.0 kpa.
Thus: V = nRT/P = 0.5 x 8.317 x 273/65 = 17.45 L
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