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Question 1) - Calculate the total number of conformations generated in a drug molecule with single rotatable bond and 2.4° increment of torsion angle?
Question 2) - Lamivudine is a drug used for the treatment of HIV (AIDS). This drug stop HIV from infecting cells in the body. Only the (-)-enantiomer of lamivudine is registered for the treatment of HIV because it is more active and less toxic than either the (+)-enantiomer or the racemate. In the (-)-enantiomer, the chiral centre at position 2 has the R configuration and the chiral centre at position 5 has the S configuration. Draw the structure of (-)-lamivudine using hashed and wedged line notions that represents R configuration at 2 and S configuration at 5. Need to show your work-up. NH2 N N O O S OH
4. What mass of CuI is present in a 1.2 L saturated solution at 25°C? Ksp = 1.3 x10-12 (5 marks)
5. Will a precipitate form when 125 mL of 4.0 x 10-2 M of CaCl2 is added to 175 mL of 2.9 x 10-2 M of NaOH? Ksp of Ca(OH)2 = 4.8 x 10-6. Show the dissociation equation for the possible precipitate and all formulas. (10 marks)
2. At a certain temperature a saturated solution of BaF2 has a concentration of 4.59 x 10-2 M. What is the Ksp for BaF2 at this temperature? (3 marks)
3. What is the concentration of the ions present in a saturated Cd(OH)2 solution? Ksp = 5.3 x 10-15. (4 marks)
Kbr can dissolve in CCl4?
How many grams are in 5 dm^3 of NH3
which of the following gases at STP would have the greatest volume
Calculate the enthalpy change for the following chemical reaction:
CS2 (l) + 3O2 (g) —> CO2 (g) + 2SO2 (g)
1) C (s) + O2 (g) —> CO2 (g)
ΔH°= -393.5 kJ
2) S (s) + O2 (g) —> SO2 (g)
ΔH°= -296.8 kJ
3) C (s) + 2S (s) —> CS2 (l)
ΔH°= +87.9 kJ
Calculate the standard enthalpy change, ΔH, for the following reaction:
2CH3OH(l) + 3O3(g) —> 2CO2(g) + 2H2O(g)
Given:
CH3OH (l) ΔHf° = -238.7 kJ
CO2 (g) ΔHf° = -393.5 kJ
H2O (l) ΔHf° = -285.8 kJ
What is the [H3O+ ] of 1.0 M HF mixed with 1.0 M NaF. Ka = 6.6 x 10-4
If 0.454 kg of nitroglycerin explodes according to the following reaction: C3H5(NO2)3(l) →\rightarrow → CO2(g) + N2(g) + H2O + O2(g) What is the total volume of gases in dm3 produced at STP?
