1. A 72.1 ml sample of ethyl alcohol contains 14.6 grams of ethyl alcohol and 53
ID: 819031 • Letter: 1
Question
1. A 72.1 ml sample of ethyl alcohol contains 14.6 grams of ethyl alcohol and 53.6 grams of water. Ethyl alcohol has a molecular weight of 46.067 g/mol. Water has a density of 1.0 g/mL.
A.) What is the mole fraction of ethyl alcohol in this solution?
B.) What is the molality of the solution?
C.) What is the Molarity of the solution?
2. Consider intermolecular forces and arrange the following in order of increasing boiling point. Explain Why.
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 solid NH4NO3 and a pouch of water. The temperature of the pack drops as the NH4NO3 dissolves in water. Therefore, for the dissolving of NH4NO3 in water,
A. delta H of solution is negative and delta S of solution may be negative or positive
B. delta H of solution is negative and delta S of solution is positive
C. delta H of solution is positive and delta S of solution may be negative or positive
D. delta H of solution is positive and delta S of solution is positive
Explain Why.
Explanation / Answer
3. answer delta H of solution is positive and delta S of solution is positive
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