Question

ID: A Exam 3 Multiple Choice Identify the choice thar best completes the worawer the question 1. Le Chatelier's principle states that a. Only exothermic reactions can reach chemical equilibrium b. If a chemical equilibrium is disturbed, the system will try and reestablish equilibrium c. If a chemical equilibrium is disturbed, the temperature of the system will always decrense d. Only reactions in which a catalyst is present can reach chemical equilibrium 2. Which of following statements concerning theoretical yield, actual yield, and percent yield is correct? Percent yield is calculated by dividing the theoretical yield by the actual yield. b. A percent yield of greater than 50% is very difficult to obtain c. Theoretical yield is a calculated number. d. Actual yield is a calculated number. 3. A 0.45 mole of krypton gas occupies a volume of 1.6 L. What volume will 1.8 moles of krypton occupy assuming the temperature and pressure remain the same? a. 0.40 L c.0.51 L b. 6.4 L d. 3.2L 4. Which of the following is the correct equilibrium constant expression for the reaction 4HCl() +20 211,06+ 2Cl24 [HC] [0] [Q," (,01 [a][HO] hapº,] 1 K [C] [Horº [HC1J' [0] K., HC][O] d. [0,1,01 5. At what pressure would methane gas occupy 13.8 L if it occupies 5.74 L at 3.67 atm assuming constant temperature? 11.3 atm a. c. 21.6 atm b. 1.53 atm d. 8.82 atm 6. Calculate the [OH) in an aqueous solution when the [H,0") is 1.2 x 10- M. a. 8.3 x 10-11 M c. 1.0 x 10-14 M b. 2.0 x 10-10 M d. 3.8 x 10-10 M

Answer 1

he-chateliers principle states that if a chemical equilibruim'is disturbed, it moves in a direction so to countereffect the change. o the system will try to reestablish equilibonim option - ana Percentages yield Actual yillig, x 100 T yilld anperimental & 10 Theoretical yild = enpvrimental yield calculated using initial moles of réactants takel oploon () M2 = ? noget Vaz1-8 moles Aus 3 n,=0.45 mole V=16h According to Avogadro's law Accouding van CamScanner
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N = R 1.66 x 1.8 uxol 0.45 mol V = 6.4 € - option © a* Ha (4) + O2 = 24,2%)+ 20.9) keq = [H2O3* [Uz] 1 [HQ]" [ Oz] option Aust According to Boyle's law 1. P, V, = P2 V₂ P, = 3.67atin Pe=? 3. 67 atin 85.744 =PLx13.84 v=5.742 = 13.82 P2 = 3.67 atm x 5.74 - 13.8 cs Scarled svithl-52 6 atin a 1.53 atin aplicon © CamScanner