Question

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