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The thermite reaction is a very exothermic reaction; it has been used to produce liquid iron for welding. A mixture of 2 mol of powdered aluminum metal and 1 mol of iron(III) oxide yields liquid iron and solid aluminum oxide. How many grams of the mixture are needed to produce 313 kJ of heat?

  • Chemistry - ,

    2Al + Fe2O3 ==>2Fe and Al2O3 + ??kJ heat.
    Do you know the kJ heat produced? If so,
    313 kJ/?? kJ = moles Fe2O3 needed and convert that to grams Fe2O3.
    (313 kJ/?? kJ) x 2 = moles Al needed and convert that to grams Al.
    Add the grams Fe2O3 and grams Al to get the grams of the mixture needed.

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