اسئلة كيمياء في شابتر 5

[sumaiah..]

السلام عليكم

هذي 9 اسئله لإكرآم دآنش

ابغى اعرف بس طريقة الحل الله يسعدكم
وان شاء الله فل مارك للكل وللي تساعدني خآآصة دعوه في ظهر الغيب ..


2. A small bubble rises from the bottom of a lake, where the temperature and pressure are 4°C and 3.0 atm, to the water's surface, where the temperature is 25°C and the pressure is 0.95 atm. Calculate the final volume of the bubble if its initial volume was 2.1 mL.



A. 0.72 mL

B. 6.2 mL

C. 41.4 mL

D. 22.4 mL

E. 7.1 mL







3. Calculate the mass, in grams, of 2.74 L of CO gas measured at 33°C and 945 mmHg.



A. 0.263 g

B. 2.46 g

C. 3.80 g

D. 35.2 g

E. 206 g









4. Which of the following gases will have the greatest density at the same specified temperature and pressure?



A. H2

B. CClF3

C. CO2

D. C2H6

E. CF4



5. Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97°C. The pressure of the chloroform is 728 mmHg.



A. 187 g/mol

B. 121 g/mol

C. 112 g/mol

D. 31.6 g/mol

E. 8.28 ´ 10-3 g/mol







6. What is the molar mass of Freon-11 gas if its density is 6.13 g/L at STP?



A. 0.274 g/mol

B. 3.64 g/mol

C. 78.2 g/mol

D. 137 g/mol

E. 365 g/mol







7. A mixture of three gases has a total pressure of 1,380 mmHg at 298 K. The mixture is analyzed and is found to contain 1.27 mol CO2, 3.04 mol CO, and 1.50 mol Ar. What is the partial pressure of Ar?



A. 0.258 atm

B. 301 mmHg

C. 356 mmHg

D. 5,345 mmHg

E. 8,020 mmHg







8. A sample of hydrogen gas was collected over water at 21°C and 685 mmHg. The volume of the container was 7.80 L. Calculate the mass of H2(g) collected. (Vapor pressure of water = 18.6 mmHg at 21°C.)



A. 0.283 g

B. 0.572 g

C. 0.589 g

D. 7.14 g

E. 435 g













9. A 0.271 g sample of an unknown vapor occupies 294 mL at 140°C and 847 mmHg. The empirical formula of the compound is CH2. What is the molecular formula of the compound?



A. CH2

B. C2H4

C. C3H6

D. C4H8

E. C6H12







10. How many liters of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2?

MnO2(s) + 4HCl(aq) ® MnCl2(aq) + 2H2O(l) + Cl2(g)



A. 5.36 ´ 10-3 L

B. 0.138 L

C. 0.282 L

D. 3.09 L

E. 3.55 L