Solving the Kc of a Chemical Reaction with N2O4

mooneh
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heey i have this chem homework quest :

5 L flask is filled with 0.625 mol of (N2O4) if you know that concentration of (N2O4) at equilibrium = 0.075 M
what is the kc for the rxn ??
2 NO2 → N2O4
 
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god almighty... show your work.
 
Thread 'Confusion regarding a chemical kinetics problem'
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