Now they feel it is best to have you identify an unknown gas based on its properties. suppose 0.508 g of a gas occupies a volume of 0.175 l at a temperature of 25.0◦c is held at a pressure of 1.000 atm. what gas is this most likely?
neon
chlorine
fluorine
oxygen
krypton

Option (b) is the correct answer.

Explanation:

The given data is as follows.

             mass = 0.508 g,               Volume = 0.175 L

             Temperature = (25 + 273) K = 298 K,       P = 1 atm

As per the ideal gas law, PV = nRT.

where,  n = no. of moles =

Hence, putting all the given values into the ideal gas equation as follows.

               PV =            

           1 atm \times 0.175 L =  

                            = 71.02 g

As the molar mass of a chlorine atom is 35.4 g/mol and it exists as a gas. So, molar mass of is 70.8 g/mol or 71 g/mol (approx).

Thus, we can conclude that the gas is most likely chlorine.

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