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Consider the reaction. 2 Fe,O, 4 Fe +30, AHAD +824.2 kJ The formation of 43.0 g of Fe results in the absorption of 635 kJ of
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Answer #1


Molar mass of Fe = 55.85 g/mol


mass(Fe)= 43.0 g

use:
number of mol of Fe,
n = mass of Fe/molar mass of Fe
=(43 g)/(55.85 g/mol)
= 0.7699 mol
Since Δ H is positive, heat is absorbed
when 4 mol of Fe reacts, heat absorbed = 824.2 KJ
So,
for 0.7699 mol of Fe, heat absorbed = 0.7699*824.2/4 KJ
= 159 KJ
Answer: the absorption of 159 KJ of heat

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