Question

Question 1    :  
For the reaction

A(aq) ---> B(aq)

the change in the standard free enthalpy is 3.37 kJ at 25 ^oC and 4.81 kJ at 45 ^oC. Calculate the value of this reaction's equilibrium constant at 75 ^oC.  

Question 2    :  
A container encloses 33.0 g of CO₂(g). The partial pressure of CO₂ is 2.44 atm and the volume of the container is 28.8 L. What is the average, or root mean square, speed (in m/s) of the CO₂molecules in this container?  

Question 3    :  
We have 500.0 mL of a buffer solution that is 0.688 M in NH₃ and 0.351 M in NH₄Cl. We add 500.0 mL of a solution 0.213 M in HCl. The final volume is 1.0000 L. The K_b value for NH₃ is 1.8 x 10^-5. What is the pH of the final solution?

Answer 1

Ans! A (aq) → B (ar) AGO= 3.37 kg at f=25€ AGO = 4.81 kg at T=45°C Require ke at 150c AC = RT Ink at aroc -sGo ke 2 -3.37 103 RT 8.314 X 298 at usoc, keq ce 4.81x 103 R7 8.3148298 0.25% 0.143 -ani's Ink keq IT 298k 0.257 -1.366 -1.944 3-36 x 10 ml 3. lus x 10 0.143 318 K Slope - 1.944 +1366 3.145 - -3.36) 70 at 750 с 2.874810"} 17= 34 K A alique look anknown 3.45 2.829) x1003 2688 Inkaroca 0.728 f lique Inkaso 2.672 K 75°c 0-2.872 Kase 0.069

33g al Co2 n 38g/mw Top fr= har P = 2.4 yahm latm = 1.01325 X 1Spq WE 28.8L -0.0288 m3 "3er nmw 3x2 47233 Alm2 xo. 6288 m3 337 X 10 34 x ma mo Veng = 804. 550 m/s.

An 2. addition ! ..203 m in hel Mole el Buler L added solution We Total wakime is looL ned moles o NHS = 0.688 xl.co 0.688 moles al moles a NHuel = 0.357 X 7.00 = 0.357 moles A. ex MH = 1.4 xe “s 4.9447 APH = 14- (Pk + log which . No almole a NHZolte adding Hei 30.6S -0.213 o.uzs male al moles of NHull oftes addrug Hel 0.357 +0.213 - 0.564 moles. PH = 14 +2447 tleg o. 564 G. URS Py=14- 4.8192 -9.lood Here the pH valur is 9. 18of a PH -9.2
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