Teacher Doesn\'t Post an Answer Sheet, Plz Help! 16. Kinetic energy is the energ

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Teacher Doesn't Post an Answer Sheet, Plz Help!

16. Kinetic energy is the energy of motion and change. (A). True (B). False

17. If a sample of 0.50 moles of He occupies 4.2 L under certain conditions, what volume will 0.23 moles occupy under the same conditions?

18. What is the volume of 2.75 g of H2 gas at 4.75 atm and 315 K?

19. A 0.465 g sample of an unknown compound occupies 0.245 L at 298 K and 17.9 psi. What is the molar mass of the unknown compound?

20. A mixture of 5.00 g of He and 5.00 g of Ne have a total pressure of 2.50 atm. What is the partial pressure of He?

21. Calculate the root mean square velocity of hydrogen molecules at 22.00 °C. Urms = (3RT/M) 1/2 where R = 8.314 J/mol.K

22. One of the following equation/law is used to calculate the properties of a gas under non-ideal conditions. (A). Dalton's Law (B). Charles's Law (C). Boyle's Law (D). van der Waals equation (E). Avogadro's Law

23. The atmospheric pressure is 720. mmHg. What is the pressure in inches of Hg (in Hg)?

24. Which of the following gas samples has the greatest density at STP? (A). SF6 (B). NO (C). He (D). CO2 (E). All of these materials have the same density at STP.

25. A mixture of 0.152 moles of NO, 0.245 moles of H2 and 0.993 moles of Ar has a total pressure of 5.75 atm. Calculate the partial pressure of Ar?

26. Calcium hydride (CaH2) reacts with water to form hydrogen gas, according to the following reaction. CaH2(s) + 2H2O(l) Ca(OH)2(aq) + 2H2(g) How many grams of calcium hydride (CaH2) are needed to generate 2.50 L of hydrogen gas at a pressure of 0.900 atm and a temperature of 38.20 °C?

27. Consider the following combustion reaction: C2H4(g) + O2 (g) CO2(g) + H2O(g) (not balanced) Determine the number of liters of CO2 gas formed at STP when 2.45 grams of C2H4(g) is burned with excess oxygen gas.

28. Which of the following gas will have the greatest volume at STP (A). 2.5 g N2 (B). 2.5 g O2 (C). 2.5 g Ar (D). 2.5 g NO (E). 2.5 g CO2

29. The volume of a gas is proportional to number of moles of a gas at constant pressure and constant temperature is known as (A). Ideal Gas Law (B). Charles's Law (C). Avogadro's Law (D). Dalton's Law (E). Boyle's Law

30. If a sample of 1.25 moles of Ne occupies 2.6 L under certain conditions, what volume will 8.79 moles of Ne occupy under the same conditions?

31. How many grams of KCl(s) are produced from the decomposition of KClO3(s) which produces 125.0 mL of O2(g) at 34.5°C and 1.22 atm pressure?

Explanation / Answer

16. True. Kinetic energy is the energy of motion and change. (change is displacement)

17.

N1/V1 = N2/V2

V1*N2/N1 = V2

4.2*0.23/0.5 = 1.932 L

18.

V = nRT/P

    = (2.75 g/2.02 g/mol) * (0.0820 L atm/molK)* 315/ 4.75

    = 7.40 L

19. 38.0 g/mol

20. 0.4 atm

21. 2712 m/sec

22. D. Van der Waals equation

23. 28.35 in Hg

24. A. SF6

25. 4.11                atm

26. 1.85 g

27. 1.95 L

28. A.2.5 g N2

29. C. Avogadro’s law

30. 18.28 L

31. 0.298 g = 0.3 gm

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