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

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.