A tank with volume of 2.4 cu ft is filled with Methane to a pressure of 1500 psia at 104 degrees F. Determine the molecular weight and specific gravity of the gas and the pound mols, pounds, and density of gas in the tank.

Explanation:

It is known that equation for ideal gas is as follows.

               PV = nRT

The given data is as follows.

     Pressure, P = 1500 psia,     Temperature, T = = 104 + 460 = 564 R

     Volume, V = 2.4 cubic ft,      R = 10.73

Also, we know that number of moles is equal to mass divided by molar mass of the gas.

                n =

            m =

                =

                = 9.54 lb

Hence, molecular weight of the gas is 9.54 lb.

We will calculate the density as follows.

                d =

                    =

                    = 3.975

Now, calculate the specific gravity of the gas as follows.

  Specific gravity relative to air =

                         =

                         = 51.96

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257 grams h2o i think