Chem 107 Exam IL, Page 5 of 12 Oct 19, 2017 A. 10 C B. 40°C C. 146°C D. 313°C E.

Question

Chem 107 Exam IL, Page 5 of 12 Oct 19, 2017 A. 10 C B. 40°C C. 146°C D. 313°C E. 685°C 16. (3 points) Which one of these gases is "lighter-than-air"? A. CZ B. SO2 C. PH D. NO E. Ne 17, (3 points) Two moles of chlorine gas at 200°C are beated to 350°C while the volume is doubled. The density of the gas A. incresse B. decrease C. depends on the pressure D. remains the same E. Not enough information is given to cotrectly answer the question. 18. (3 points) Determine the molar mass of chiloroforms gas if a sample weighing 0.389 g is collected in a Bask with a volume of 102 cm at 97 C. The pressure of the chlorofoem is 728 mmHg. A. 187g/mol B. 121 g/mol C. 1.12 × 102g/mol D. 8.28×10-3g/mol E. 31.6g/mol 19. (3 points) A sample of hydrogen gas was collected over water at 21 °C and 685 mmHg. The volume of the container was 7.80L. Calculate the mass of Ha() collected. (Vapor pressure of water 18.6 mmlg at 21 C.) A. 0.283g B. 0.571g C. 0.589g D. 7.14g

Explanation / Answer

16)
air is mainly composed of N2 whose molar mass is 28 g/mol
So, all those gases with lesser molar mass than 28 g/mol will be lighter
Ne has molar mass of 20 g/mol
So, this will be lighter than air
Answer: E

17)
number of moles is same. So, mass will be same
Volume is doubled
density = mass / volume
So, density will become half
Answer: B

I am allowed to answer only 1 question at a time

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