Indicate which of the following has the lowest standard molar entropy(S degree).

Question

Indicate which of the following has the lowest standard molar entropy(S degree). HI dissociates to form I_2 and H_2:2 HI (g) rightarrow H_2(g) + I_2(g). If the concentration of HI changes at a rate if -0.45 M/s, What is the rate of appearance of I_2(g)? 0.13 M/s 0.90 M/s 0.45 M/1.00 M/s Why hydrogen reacts with a metal to form a hydride, what are the oxidation numbers of the calcium (in this case)and hydrogen respectively, in the product? +2 and -1 0 and 0 + 2 and -2 -2 and +1 +1 and -2. The standard molar entropy of lead(II) bromide (PbBr_2) is 161 J/mol K. What is the entropy of 2,45 g of PbBr_2?

Explanation / Answer

1.

choose a solid, since those hav ethe least entopy

choose a small molecule or even an element, since they are very simle

therefore

Na will be a good solution

2

ratio is 1:2 so

1/2*0.45 = 22.5 M/s appearance

3.

CaH2 --> Ca+2 and H must be -1 charged in order to have 0 charge overall

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