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The chemical equation above is a chemical reaction between iron (Fe) and ammonia (NH3) to create the complex compound ferriammonia (Fe(NH3)6). According to the chemical equation, to create 2 molecules of Fe(NH3)6, we need 1 mol of iron and 6 mol of ammonia.
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Reaction conditions: For the reaction to occur, iron needs to be heated up in an ammonia gas environment. The temperature of the reaction is usually maintained at a moderate level.
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Reaction process: When iron is heated up in an ammonia environment, it will absorb ammonia and create a black layer of complex compound on the surface. This process continues until either iron or ammonia is depleted.
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Observable phenomenon: When the reaction occurs, you can see the phenomenon of iron gradually being “swallowed” by the black layer of complex compound. If the reaction is complete, the iron mass will be completely gone, replaced by a solid mass of black substance.