1. A substance has solubility of 64g in 100g water. Adding 32g of the substance
ID: 785792 • Letter: 1
Question
1. A substance has solubility of 64g in 100g water. Adding 32g of the substance to 50g water, the resulting solution is:
A. saturated
B. none of these
C. unsaturated
2. Calculate the grams NaCl needed to prepare 250.0g of a 2.0m solution.
A. 30
B. 26
C. 116
3. How much of a 4.0%(m/m) NaCl solution contains 7.55g of NaCl?
A. none of the answer are correct
B. 189
C. 0.302
D. 40
4. According to Figure 31.1 (Voyce text), ~80g of Pb(NO3)2 will dissolve in 100g water at ____ oC
A. 70
B. 20
C. 50
5. water is a polar solvent, hexane is a nonpolar solvent. vegetable oil (nonpolar) will most likely be soluble in:
A. water
B. hexane
6. What is the solubility of CO2 gas at 1.7 atm pressure, at 25oC? (kH of CO2 = 3.4 x 10-2)
A. 0.0578
B. none of these
C. 0.0200
D. 50.0
Explanation / Answer
1. C. unsaturated
2. A. 30
3. B. 189
4. C. 50 (I'm not sure about it as figure was not mentioned). But it must be either 20 or 50.
5. B. hexane
6. D. 50.0
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