What is the absolute magnitude of the rate of change for [NH3] if the rate of change for [Hz] is 9.00 M/s in the reaction 2 NH3(g) → N2(g) +
3 H2(g)?

Explanation:

Hello,

In this case, we can write the law of mass action for the undergoing chemical reaction, based on the rates and the stoichiometric coefficients:

In such a way, knowing the rate of formation hydrogen (H₂), we can know the  rate of change of ammonia, that must be negative for consumption:

Nevertheless, the absolute magnitude will be positive:

Best regards.

increased stability in the completion of fluorine's outer shell.