A classic exothermic metal displacement reaction

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Thermit reaction Aluminium + Iron(111) oxide ---->Aluminium oxide + Iron Due to very high temperatures (up to 2400°C, reaction enthalpy: 852 kJ/mol) the reaction of iron oxide with aluminium forms elemental iron, which seeps in liquid form out of the flower pot drainage hole:

Useful link although it doesn't define statements correctly and cannot spell phosphorus

Associated maths If you want to use 10g of Al, what mass of iron oxide is required What mass of iron will form How much heat is released