A mixture of hydrogen gas and chlorine gas remains unreacted until it is exposed to ultraviolet light

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A mixture of hydrogen gas and chlorine gas remains unreacted until it is exposed to ultraviolet light from a burning magnesium strip. Then the following reaction occurs very rapidly: 

H(g) + Cl(g)  2HCl(g)

Explain.

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Chemistry An Atoms First Approach

ISBN: 9781305079243

2nd Edition

Authors: Steven S. Zumdahl, Susan A. Zumdahl

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