Introduction to physical chemistry UE Past Papers Questions.


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(2393) Question Category: Mathematical Calculation

When 0.6 L Ar at 1.2 atm and 227°C is mixed with 0.2 L O_{2}  at 501 torr and 127°C in a 400 mL flask at 27°C, what is the pressure in the flask?

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(2394) Question Category: Mathematical Calculation

Benzoyl peroxide, the substance most widely used against acne, has a half life of 9.8 imes 10^{3} days when refrigerated. How long will it take to lose 5% of its potency?

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(2395) Question Category: Mathematical Calculation

Derive the rate law that is consistent with the proposed mechanism in the formation of phosgene from Cl_{2} and CO. (K_{1}=frac{k_{1}}{k_{-1}}   and K_{2}=frac{k_{2}}{k_{-2}} may be considered as equilibrium constants of the elementary processes and M is any inert molecule)

  1. Cl_{2}+M ightleftharpoons 2Cl+M (fast equilibrium, K_{1})
  2. Cl+CO+M ightleftharpoons ClCO+M(fast equilibrium,K_{2})
  3. ClCO+Cl_{2} ightarrow Cl_{2}CO+Cl(Slow,K_{3})

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(2396) Question Category: Mathematical Calculation

A voltaic cell consists of a standard H_{2} electrode and a Cu/Cu^{2+} electrode. Calculate [Cu^{2+}] when E_{cell} is 0.25 V. Given Cu^{2+}/Cu=0.34V.

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