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Chemistry
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15 Jun 2020

Whcih of the following is in the correct order of standard state entropy?

I. Liquild water < gaseous water

II. Liquild water < solid water

III. NH3 < H2

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General Chemistry 2
Skill
Solve problems relating to entropy
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Related questions

1. A 72.1 ml sample of ethyl alcohol contains14.6 grams of ethyl alcohol and 53.6 grams of water. Ethyl alcoholhas a molecular weight of 46.067 g/mol. Water has a density of 1.0g/mL.

A.) What is the mole fraction of ethyl alcohol in thissolution?

B.) What is the molality of the solution?
C.) What is the Molarity of the solution?


2. Consider intermolecular forces and arrangethe following in order of increasing boiling point. ExplainWhy.

I. CH3CH2OH

II. CH3CH2CH3

III.H3C-O-CH3

IV. CH3CH2NH2


a. IV < III < II < I

b. II < III < IV < I

c. I < IV < III < II

d. II < III < I < IV

e. III < IV < I <II


3. Commercial cold packs often contain solidNH4NO3 and a pouch of water. The temperature of the pack drops asthe NH4NO3 dissolves in water. Therefore, for the dissolving ofNH4NO3 in water,

A. delta H of solution is negative and delta S of solution maybe negative or positive

B. delta H of solution is negative and delta S of solution ispositive

C. delta H of solution is positive and delta S of solution maybe negative or positive

D. delta H of solution is positive and delta S of solution ispositive

Explain Why.

Calculate the standard enthalpy of formation of liquid water (H2O)using the following thermochemical information:

N2(g) + 3 H2(g) <=> 2 NH3(g) Delta H = -92.4 kJ
2 NO(g) <=> N2(g) + O2(g) Delta H = -180.7 kJ
4 NH3(g) + 5 O2(g) <=> 4 NO(g) + 6 H2O(l) Delta H = -1167.1kJ


H = __ kJ

What is the order of ring strain per CH2 group in the rings below?

I < II < III

I < III < II

III < I < II

II < I < III

II < III < I

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