PART II-Short Answer or Short Calculation (46 points). Show work and provide uni
ID: 697806 • Letter: P
Question
PART II-Short Answer or Short Calculation (46 points). Show work and provide units for your answers where appropriate for full credit. 9. 4 pts each. Given the following reaction use Le Chatelier's principle to reactants, shifts to make products, or no change (circle one) and then give a short explanation why this is true. if the equilibrium shifts to make U02 (s) + 4HF(g) = UF.(g) + H20(g) 1° is negative i) the pressure is increased: make reactants no change nous of 9a2cos reactan acants and two Si de gaseous fridods, 4eslofheliss moes ol CY temperature is decreased: make reactants,o ake produ make products, no change ili) uranium tetrafluoride is removed: (make iv.) NH(g) is added: make reactanits, (make products no change 10. 8 pts Basel on the following information: N2(g) + 3H2(g) 2NH3(g) where Kc-0.278 at 98 point during the reaction: IN21-0.589M, [H1 = 0.283 M and [ NII,la 0 aExplanation / Answer
Given that, UO2(s) + 4HF(g) ========= UF4(g) + H2O(g) ; dH = -ve
1) If pressure is increased, reaction shifts to right side and produces more products
Reason: No of moles of gaseous reactants is greater than no.of moles of gaseous products. If pressure increases, volume decreases and shifts the reaction to the side of less no. of moles i.e., products side
2) If temperature is decreased, reaction shifts to right side and produces more products
Reason: Since the reaction is exothermic, decrease in temperature shifts the reaction towards product side (for exothermic reaction, low temperature favors forward reaction)
3) If UF4 is removed, reaction shifts to right side and produces more products
Reason: If concentration of reactants increases or concentration of products decreases, reaction shifts to forward direction
4) If NH3 is added, reaction shifts to left side and produces more reactants
Reason: NH3 reacts with HF and forms NH4F and hence decreases the concentration reactants(HF) and shifts the reaction backward
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