7. The concentrate of carbon dioxide inside a closed container is 0.5 M. What is

Question

7. The concentrate of carbon dioxide inside a closed container is 0.5 M. What is the partial pressure of the carbon dioxide above the liquid? The Henry's Law constant of CO2 is 0.034 mole/L-atm. A. 0.017 atm B. 14.7 atm C. 4.1 atm D. 34 atm 8. What statement is true about Henry's Law A. The concentration of a gas dissolved in a liquid is indirectly proportional to the concentration of the gas over the iquid B. The Henry's law constant for every gas is the same as long as it dissociates completely C. Henry's law is D. The partial pressure of a gas t vapor pressure over a liquid in a sealed container. gasses dissolved in the liquid. Values for water: enthalpy of fusion: 333.55Wg: enthalpy of vaporization: 2257 Jg. Specific heat of ice: 2.108 JgC; specific heat of liquid water: 4.187 Jig C; specific heat of steam:1.996 wgc. 9. How much heat is absorbed by 200g of OP ice as it thaws? A. 66,710J B. 451,400J C. 421.6J D. 837.4J 10. If 500 g of steam cools from 150 C to 100°C, how much heat is released? A. 983 J B. 104,675 C. 49,150 D. 93.3 J 11. What is the osmotic pressure of a 2 M solution of KSO4 at 298 K? Gas constant The Van t' Hoff constant for potassium sulfate is 2.6 0.0821 atm K mol A. 18.8 atm B. 48.9 atnm C. 127 atm D. 0.213 atm 12. Circle the molecule that you would expect to be highly insoluble in water -0-H H-C-C-0-H

Explanation / Answer

Multiple choice

7. Accoridng to Henry's law,

Concentration = partial pressure x henry's constant

therefore,

partial pressure of CO2 = 0.5 M/0.034 mol/L.atm = 14.7 atm

B. 14.7 atm

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8. True statement about Henry's law would be,

D.

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9. Amount of heat absorbed by 200 g ice at 0 oC to go to liquid state,

= mdHf = 200 x 333.55 = 66,710 J

A. 66,710 J

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10. Heat released when 500 g steam cools from 150 oC to 100 oC

= mCpdT = 500 x 1.996 (100-150)

C. 49,150 J

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11. osmotic pressure = iMRT

                                   = 2.6 x 2 x 0.0821 x 298

C. 127 atm

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12. Hydrocarbon will be insoluble in water

second molecule from left.

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