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    Five Physical Chemistry Questions

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    5) Ozone decomposes to oxygen according to the balance chemical equation below:
    2O3 ---> 3O2
    If the rate of disappearance of the ozone is -7.2E-4 M/s, what is the rate of formation of oxygen?

    6) If 100kJ of heat is added to 54.0 g of water at 100°C, what is the final state of the water?
    MW H2O = 17.9 g/mole

    7) How many grams of NaCl do you need to add to 5.00 kg of water to make a solution that freezes at -
    10.0°C (assume an ideal solution)? MW NaCl = 58.4 g/mole

    8) If an individual records a blood alcohol level of 0.0267M (0.16% by volume), what will this person's
    blood alcohol level be 4 hours later if the rate constant for the oxidation of ethanol in the liver is 0.00425

    10) The reaction of NO and O2 produces NO2
    2NO(g) + O2(g) ---> 2 NO2(g)
    The rate constant is second order with respect to NO(g) and first order with respect to O2(g). At a given temperature, the rate constant, k, equals 6.1E3 M-2S-1. What is the rate of reaction when the initial concentrations of NO and O2 are 0.020 M and 0.015 M respectively?

    Potentially useful information
    PV = nRT
    ln(A/Ao) = -kt
    1 atm = 760 mmHg
    lnP = (- H/RT) + c
    1/A - 1/Ao = kt
    Room temperature = 25°C = 298K
    ln (P2/P1) = (H/R)(1/T1-1/T2)
    Ao - A = kt
    R = 8.31 J/(mol K) = 0.0821 (L atm)/(mol K)
    T = Kmi
    t1/2 = 0.693/k
    Kbp for water: 0.512°C/m
    Pa = Xa Pa
    kH for N2 = 8.42E-7 M/ mmHg
    Kfp for water: -1.86°C/m
    = cRTi

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    Solution Summary

    Solutions to five questions that focus on kinetics and colligative properties are shown.