5. What volume of gas K and 0.500 atm is produced by the decomposition of 0.10 m

Question

5. What volume of gas K and 0.500 atm is produced by the decomposition of 0.10 mol of at 2 by the following reaction? 2NaN (s) 2Na(s) 3N2(g) A. 7.34 L B. 2.24 L C. 14.7 L D. 3.67 L E. 4.89 L 6. The following reaction occurs at standard temperature and pressure. What volume 4Al(s) 302 (g) 2Al203 (s) A. of O2(g), at STP, in required to completely react with 8.00 mol of Al(s)? 269 L. B. 33.6 L C. 134 L D. 67.2 L E. 44.8 L 7. Put the following in order from the one with the lowest to the one with the highest RMs average velocity? 1. H2 at 298 K. 2. Ar at 273 K. 3. Ar at 298 K. Lowest Highest A. 1 3 2 B. 1 2 3 C. 2 1 3 D. 2 3 1 E. 3 1 2 8. which of the following statements describes a completely elastic collision between gas molecules? A. The molecules stick together after the collision B. The molecules do not collide because they repel each other from a distance. C. The molecules attract each other before they collide. D. The total energy is conserved, but it can exchange between kinetic and potential energy. E. There is no loss of kinetic energy

Explanation / Answer

5)

from the reaction

moles of N2 = 1.5 x moles of NaN3

moles of N2 = 1.5 x 0.1

moles of N2 = 0.15

apply

PV = nRT

0.5 x V = 0.15 x 0.0821 x 298

V = 7.34 L

so the answer is option A

6)

from the reaction

moles of 02 = 0.75 x moles of Al

moles of 02 = 0.75 x 8

moles of 02 = 6

at STP

volume of gas = moles x 22.4

volume of 02 = 6 x 22.4

volume of 02 = 134 L

so the answer is option C

7)

RMS velocity = sqrt ( 3RT / M )

so the answer is option D

8) option E

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