why in  Fe 2 O 3 .nH 2 O.The number of water molecules in rust is variable?

The formation of rust depends upon the level of humidity in the atmosphere, the higher the humidity the iron oxide will be surrounded by more water molecules and the rate of rusting will also be high. However, if the humidity is less then less amount of water molecules will surround the iron oxide, and the rate of the rusting will also be slow. Therefore in the chemical formula of rust the amount of water is variable.

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