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Chemistry
Chemistry
Problem
A sealed flask contains gaseous chlorine composed of 75 %
35
Cl
2
^{35}\text{Cl}_2
35
Cl
2
molecules and 25 %
37
Cl
2
^{37}\text{Cl}_2
37
Cl
2
molecules. State whether this sample is a pure substance or a mixture and justify your choice in one or two sentences.
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