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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
M/hour?

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 = (- &#61636;H/RT) + c
1/A - 1/Ao = kt
Room temperature = 25°C = 298K
ln (P2/P1) = (&#61636;H/R)(1/T1-1/T2)
Ao - A = kt
R = 8.31 J/(mol K) = 0.0821 (L atm)/(mol K)
&#61636;T = Kmi
t1/2 = 0.693/k
Kbp for water: 0.512°C/m
Pa = Xa Pa
o
kH for N2 = 8.42E-7 M/ mmHg
Kfp for water: -1.86°C/m
&#61648;&#61472;= cRTi

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#### Solution Summary

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

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