Name PerReview Sheet: The Gas Laws

1. List the 5 components of the Kinetic Molecular Theory.

• .?

2. How do gas molecules produce pressure?

3. What is the formula for pressure?

4. What instrument measures atmospheric pressure?

5. Convert: a) 15.5 psi to atm b) 880. mm Hg to kPa

} ÿ "5 (,ÿ , x i ,4ÿ'vÿ j , io l..3 r4",,

6. What is Dalton's Law (write the formula)?

c) 0.85 atm to Torr

7. A mixture of helium, oxygen, and nitrogen in a scuba tank for a 100 meter dive has a total pressure of 2000 --t'tÿ.ÿ, Ipsi. The helium has a partial pressure of 1400 psi, and the nitrogen has a partial pressure of 400 psi. What

,.a .ÿ Qis the partial pressure.of the oxygen? ÿ', i'-'ÿval -- I" ÿ I',. ÿ" P

)ÿ" OC-,-,,.,, iÿt)L, ÿ- HOo w i'ÿ2 sÿ (i:z..--k) w w

8. What happens to pressure if volume is decreased (constant T)? Write the formula relating these twovariables. V ÿk iÿ "i" i cart fS ¢ÿ

9. What happens to pressure if temperature is increased (constant V)? Write the formula relating these twovariables. -T 'F" f"1" D i €'c c l"

10. What happens to volume if temperature is decreased (constant P)? Write the formula relating these twovariables. "T 4,, ÿ/4, piÿeC{"

11. Which law relates P, V and T (none constant)? Write the formula.

12. Which gas law allows you to work with moles or mass of a gas? Write the formula.Ca + .2i4c.I -----7 Cc,ÿclz ÷ t-iz

13. Calcium reacts with hydrochloric acid to produce calcium chloride and hydrogen gas. If 2.00 moles of HC1react with excess calcium, what volume of hydrogen gas will be produced at STP? (Hint. first write theequation, balance#, thenusestoich!)(22.4LH2) 2.ÿdm,4 ',4(.1 x Iÿi i i±. ,ÿ 2z,ÿfc- 14ÿ_. ZZ.q t.. 147.

BALANCED EQUATION: --Zmo, 0ÿ1 Iraqi t4'z -_____ÿVÿ = Pz ÿ/_....._..k'-

14. If 13.0 g of gas at 0.996 atm is increased to a 32.0 L volume, what is the pressure at constant temperature?Formula needed Rearrange for Plug-in to formula Final answer Unit

unknown Include units and cancellation.t

P,v', - Vÿ. !"z

0.qfltÿt-m x iÿ.0CI% z.o L

(0.405) (atm)

Unit conversion(s) needed:

15. At a pressure of 1.0 atm, the volume of a bubble is 3.08 L at 4°C. What is the volume at a pressure of 350

mm Hg and 14°C? Tÿ ÿ- 2 9-i KFormula needed Rearrange for Plug-in to formula . Final answer Unit

unknown Include units and cancellation,t"'IÿVÿ V'z= 7tÿ!)mm,.t.ÿarÿ.0ÿL.ÿ,2ÿ,.7ÿ___ (6.9) (L)

= .__ÿ! V'j Tÿ Unit conversion(s) needed:

u i", : ?-fi'/K ÿÿ'ÿ"ÿ¢ÿ uÿÿif '--- - ÿt"

16. If a gas occupies 15.1' L at 24°C, what is the volÿe at 72°ÿ. Pressure is constant.Formula needed Plug-in to formula Final answer Unit

Include units and cancellation!

(i7.5) (L)

Rearrange forunknown

¢3T, "['ÿ

Tÿ: ÿbÿi< to 95°C and the volume is unchanged?Formula needed Rearrange for

unknown

@j

T,

,ic x" ÿq6t<7'z:

ZqTK

Unit conversion(s) needed:

-r, = 2,i9K ÿ ?17. A sample of air is at a pressure of2.ÿÿ atm at 25°C. What is the new pÿssure if the temperature is increased

Plug-in to formula Final answer UnitInclude units and cancellation!

(2.5) (atm)Pz= 2.0at-m ÿ 30gi<

Zqÿi<

Unit conversion(s) needed:

18. H2S(g) has a volume of 15.0 L and a mass of 2.99 g at a temperature of 46°C. What is the pressure of thegas? V ÿ ÿ aÿ-,ÿ q- : 3 iq K P = ?

Formula needed Rearrange for Plug-in to formula Final answer Unitunknown Include units and cancellation!

} 0.0,ÿ7 ÿmÿi ,'ÿ 0..0ÿZl X "3iq <(0.153) (atm)p V= rÿ AT v' i,,.OL

ffp = ÿ+'ÿ'n p : n Kq" Unit conversion(s) needed:

v-= t, V" 2 .qqÿ i4z';'× _ : innoi - : 0.ag'/1ÿi

19. What is the mass of 35.0 L of helium gas at STP? (2 ways tÿ solve this! One is gas law, one is moleconversion. Either is okay.) T" 2"13 tÿ P ÿ i. o cÿ

Formula needed Rearrange for Plug-in to formula Final answer Unitunknown Include units and cancellation!

@ (6.:5) (gPg-- I Oals-ÿ .ÿ 36 OL--"ÿ-ÿ "ilg-] (I : ' " :- I. 6ÿ oÿi ÿ+e.

PV -g-[ Unit conversion(s) needed:

i..6ÿ,,o,,oi ÿ.4e,x q,Otÿ:;ÿ ÿO,ZZ,3i too1

Answers: Gas Law Review

1. See notes, p. 1 at the top.

2. They collide with the walls of their container.

3. Pressure = Force / Area

4. Barometer

5. a) 1.05 atm; b) 117 kPa; c) 650 Torr

6. Dalton’s Law states that the total pressure in a mixture of gases

is equal to the sum of the partial (individual) pressures of the

component gases. PTOT = P1 + P2 + P3 + ….

7. 200 psi

8. Pressure increases. P1V1 = P2V2 (Boyle’s Law)

9. Pressure increases. P1/T1 = P2/T2 (Gay-Lussac’s Law)

10. Volume decreases. V1/T1 = V2/T2 (Charles’ Law)

11. P1V1/T1 = P2V2/T2 (Combined Gas Law)

12. PV = nRT (Ideal Gas Law)

13. 22.4 L H2

14. 0.405 atm

15. 6.9 L

16. 17.5 L

17. 2.5 atm

18. 0.153 atm

19. 6.25 g