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dem82 [27]
3 years ago
15

AHP for the formation of rust (Fe2O3) is -826 kJ/mol. How much energy is

Chemistry
1 answer:
mars1129 [50]3 years ago
6 0

Answer:

A- 25.9 kJ

Explanation:

ΔH of formation is defined as the amount of energy that is involved in the formation of 1 mole of substance.

ΔH of rust is -826kJ/mol, that means when 1 mole of rust is formed, there are released -826kJ.

Moles of 5.00g of Fe₂O₃ (Molar mass: 159.69g/mol) are:

5.00g ₓ (1 mole / 159.69g) = 0.0313 moles of Fe₂O₃.

If 1 mole release -826kJ, 0.0313 moles release:

0.0313 moles ₓ (-826kJ / 1 mole) =<em> -25.9kJ</em>

Thus, heat involved is:

<h3>A- 25.9 kJ </h3>

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