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(NH(4))(2)Cr(2)O(7) overset("heat") to...

`(NH_(4))_(2)Cr_(2)O_(7) overset("heat") to`

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`(NH_(4))_(2)Cr_(2)O_(7) overset("heat")to Cr_(2)O_(3)+N_(2)+4H_(2)O`
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