Question

Fill in blank with correct choice:

Choices: molar mass decreases, molar mass and structure complexity decreases, the number of gas molecules decreases, each phase (gas, liquid, solid) becomes more ordered, the atomic radius decreases, structure complexity decreases

Part A. (I2(g) , Br2(g) , Cl2(g) , F2(g) ): The ranking can best be explained by the trend entropy decreases as ______.

Part B. (H2O2(g) , H2S(g) , H2O(g) ): The ranking can best be explained by the trend entropy decreases as _____ .

Part C. (C(s,amorphous) , C(s,graphite) , C(s,diamond) ): The ranking can best be explained by the trend entropy decreases as ______ .

Answer 1

molar mass decreases than entropy will decrease because of increase in order of molecules arrangement

A. Order of molar mass = I₂ > Br₂ > Cl₂ > F₂

so order of decreasing entropy =  I₂ > Br₂ > Cl₂ > F₂

B. order of molar mass = H₂S > H₂O₂ > H₂O

so order of decreasing entropy =  H₂S > H₂O₂ > H₂O

C. Carbon amorphous is most disordered structure and after that Carbon graphite is less ordered than Carbon Diamond.

So order of decreasing entropy = C(S, Amorphous) > C(S, Graphite) > C(S, Diamond)