19. Calculate the pressure of the gas in 0.200 iner using the van der Waals equa

Question

19. Calculate the pressure of the gas in 0.200 iner using the van der Waals equation for 1.00 mole of CO2 at 0°C. A) 112 atm B) 11.2 atm C) -82.6 atm 00 mole D) 52.6 atm E) none of the above 20. A sample of helium gas was found to diffuse at a rate equal to 4.0 times that of an unknown gas. What is the molecular weight of the unknown gas? a. 2.0 g/mole b. 32 g/mole c. 16 g/mole (d 64 g/mole e. 4.0 g/mole 21. Choose the bond below that is the strongest. 22. Calculate the enthalpy change at standard conditions for the reaction: using the following thermodynamic data: 224.0 kJ a. -112.0 +41.2 c. -41.2 d. -489.2 e. 41.2

Explanation / Answer

19) PV =nRT

P = 1 mol x 0.082 L atm /mol K x 273.15 K / 0.2 L = 112 atm option A

20) rate 1 / rate 2 = (M.wt 2 / M.wt 1)1/2   1 = helium, 2 = unknown

4 / 1 = (M.wt 2 / 4)1/2

(M.wt 2)1/2 = 4 x 2

M.wt 2 = 8 x 8 = 64 g/mol option d

21) E) CN is the strongest one

22) 2Hg (l) + Cl2 (g) ------->Hg2Cl2 (s) dH = -224.00 kJ

HgCl2 (s) --------> Hg(l) + Cl2 (g) dH = 265.2 kJ

add both equation

HgCl2 (s) + Hg (l) ------> Hg2Cl2 ( s) dH = 265.2 - 224.00 = +41.2 kJ option b

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