Without referring to a data table, rank the following compounds by standard molar entropy Highest So Lowest S F2(g) Ne(g) HF(g)

Part 1)

Compounds with smaller molar mass will have higher disorder and higher entropy

Here, order will be,

Ne(g) < HF(g) < F₂(g)

Part 2)

A(s) + B(s)   C(g)

Here, solid reactants react to form the gaseous product. Therefore, this reaction will have a positive  Srxn

A(g) + B(g)  C(g)

Here, moles of the reactants are higher than the moles of products. Therefore, this reaction will have a negative  Srxn

A(g) + B(g)   3C(g)

Here, moles of the reactants are lower than the moles of products. Therefore, this reaction will have a positive  Srxn

2A(g) + B(g)  C(g)

Here, moles of the reactants are higher than the moles of products. Therefore, this reaction will have a negative  Srxn

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