Rank the gas molecules CO2, C2H6, H2O, He, H2 in terms of increasing rate of effusion. 1. CO2, C2H6, H2O, He, H2 2. CO2, C2H6, H2O, H2, He 3. He, H2, H2O, C2H6, CO2 4. H2, He, H2O, C2H6, CO2 5. None of these

Ranking the gas molecules in terms of increasing rate of effusion  is given as CO2, C2H6, H2O, He, H2

Explanation:

                 Molar mass of CO2 = 44.01 g/mol

                 Molar mass of C2H6 = 30.07 g/mol

                 Molar mass of H2O = 18.01 g/mol

                 Molar mass of He = 4 g/mol

                 Molar mass of H2 = 2.01 g/mol

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.