Can you explain and show work? 20. Thermite mixtures are used for certain types

Question

Can you explain and show work?

20. Thermite mixtures are used for certain types of weld- ing, and the thermite reaction is highly exothermic Fe203(s) 2 Al(s) Al203(s) 2 Fe(s) 852 kJ AH 1.00 mol of granular Fe2O3 and 2.00 mol of granular Al are mixed at room temperature (25C), and a reac tion is initiated. The liberated heat is retained within the products, whose combined specific heat over a broad temperature range is about 0.8Jg °C he melting point of iron is 1530 °C.)Show that the quantity of heat liberated is more than sufficient to raise the temperature of the products to the melting point of iron.

Explanation / Answer

Heat liberated from 1mol Fe2O3 reacting=852 kJ=852000 J

Mass of Fe produced= 2mol=2*56=112g

Now let the temperature rise upto T?.

Heat required for rise= mC?T=112*0.8*(T-25)

Heat provided=852000=112*0.8*(T-25)

T-25=9508

T=9533?

Which is much more than sufficient energy required to reach the melting point of iron which is 1530?.

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