Question: 1. A helium tracer study shows that a certain stream whose depth is 1.6 m has a gas exchange coefficient for helium of 1400 cm/hr.

1. A helium tracer study shows that a certain stream whose depth is 1.6 m has a gas exchange coefficient for helium of 1400 cm/hr. Stream velocity is 11 cm/sec. a. What is the reaeration coefficient, kr, for oxygen? Recall that dimensions of kr are [T1 ]. Explain any assumptions. EXERCISES 205 b. What is the gas exchange coefficient for vinyl acetate, CH3COOCHCH2? The value of the Henrys law constant is 0.02. c. The stream contains 103 M vinyl acetate at a certain location. By considering only hydrolysis loss, what will be the concentration 250 m downstream? For vinyl acetate, ka is 1.4104 /(M sec), k0 n is 1.1107 /sec, and kb is 10/(M sec). This is a hard water stream whose pH is 8.5. d. Use the same conditions as in (c), except also consider the loss mechanism of volatilization.

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