An evacuated flask weighed 30.50g when filled with dry hydrogen and 39.82gs when filled with dry chlorine at s.t.p when emptied the flask weights 30.23.calculate the RMM of chlorine?

Answer 1

mass H2 = 30.50 - 30.23 = 0.27 g......RMM H2 = 2.0
mass Cl2 = 39.82 - 30,23 = 9.59........RMM Cl2 = ?
Use proportion.
(mass H2/mass Cl2) = (RMM H2/RMM Cl2)
(0.27/9.59) = (2/x)
x = 2*9.59/0.27 = 71.0