User:Constance Dwoben

Questions on;Amount of substance and mole a.Calculate the molar mass and hence the atomic mass of X in 17.5g of a gaseous compound --X2O5 which occupied a volume of 2.8dm3 at s.t.p.[O=16;Vm at s.t.p=22.4]--Constance Dwoben (talk) 17:35, 24 August 2011 (UTC)freeminz--Constance Dwoben (talk) 17:35, 24 August 2011 (UTC)