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A tank containing Hydrogen Sulfide ( H 2 S ) gas ( molecular weight 3 4 ) has been over pressured and the flow through

A tank containing Hydrogen Sulfide (H2S) gas (molecular weight 34) has been over pressured and the flow through the relief device has been opened. A cloud of material has formed downwind of the release.
In this case, the flow of gas has been calculated to be 1.76 kg/s.
For this release, the hydrogen sulfide in the tank is at a pressure of 1MPa absolute and 25 degree C , the release occurs at ground level, and it is a clear night with a wind speed of 5.5 m/s.
a. Determine the distance downwind that must be evacuated (in km). Assume that evacuation must occur in any location that exceeds the OSHA PEL.

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