The hydrogenation of ethene gas under standard conditions (T = 298K) shows a decrease in disorder (ΔS* = -120.7 J/(mol m*K)) during an exothermic reaction (ΔH* = -136.9 kJ/mol).

C_2H_4 (g) + H_2 (g) > C_2H_6 (g)

a. Explain how you would have predicted the sign of ΔS* for this reaction.

b. Explain what is happening to the disorder of the surroundings.

c. Determine whether the reaction is spontaneous or nonspontaneous by calculating ΔG°.

d. How would the spontaneity of the reaction change with an increase in temperature? Explain.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

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