Determine the specific gravity of chlorine (cl 2) gas at 21 degrees celsius [°c] and a pressure of 0.8 atmospheres [atm]. assume chlorine is an ideal gas and obeys the ideal gas law. the molecular weight of chlorine is 70 grams per mole [g/mol].

Ideal gas law :

PV= nRT

where,

P = pressure

V= volume

n= number of moles

R= universal gas constant

T = temperature

Now, number of moles  =

Put the value of number of moles in ideal gas law,

PV= RT

PV= RT

PM= RT

Density is the ratio of mass to the volume, thus, above equation is also written as:

PM= RT

Put the values,

Temperature  = + 273 =

Pressure = 0.8 atm

=

=

Now, specific gravity =

=

1 L = 1000

So, specific gravity  =

=

Thus, specific gravity is