A.) Rank the following substances in order of decreasing standard molar entropy

Q: A.) Rank the following substances in order of decreasing standard molar entropy

A) A larger molecule has greater entropy than a small one. Therefore the order of decreasing standard molar entropy is: I2(g) > Br2(g) > Cl2(g) > F2(g).

ID: 973064 • Letter: A

Question

A.) Rank the following substances in order of decreasing standard molar entropy (S).

Rank the gases from largest to smallest standard molar entropy. To rank items as equivalent, overlap them.

Cl2(g) I2(g) F2(g) Br2(g)

B.) Consider the oxidation of NO to NO2:

NO(g)+12O2(g)NO2(g)

Standard thermodynamic quantities for selected substances at 25C

Calculate Grxn at 70 C.

Express the free energy change to three significant figures and include the appropriate units.

C.) Calculate the G°rxn using the following information.

G°rxn = ?

D.)What is the equilibrium constant of the reaction at 25°C if G° = -13.0 kJ?

2NO(g) + Br2(g) 2NOBr(g)

Substance Hf(kJ/mol) S(J/(molK)) NO(g) 91.3 210.8 NO2(g) 33.2 240.1 O2(g) 0 205.2

Explanation / Answer

A larger molecule has greater entropy than a small one.

Therefore the order of decreasing standard molar entropy is: I2(g) > Br2(g) > Cl2(g) > F2(g).

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A.) Rank the following substances in order of decreasing standard molar entropy

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