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eimsori [14]
3 years ago
9

How many kilojoules of heat will be released when exactly 1 mole of iron, Fe, is burned to form Fe2O3 at standard state condaiti

on?
Chemistry
1 answer:
Diano4ka-milaya [45]3 years ago
8 0

Answer:

412.1kJ

Explanation:

For the reaction , from the question -

4Fe (s)  +  3O₂ (g)  → 2Fe₂O₃ (s)

Δ Hrxn = Δ H°f (products) - Δ H°f (reactants)

In case the compound is in its standard state , enthalphy of formation is zero

Hence ,

for the above reaction ,

ΔHrxn =( 2 * Δ H° (Fe₂O₃ )) - [ ( 4 *Δ H° Fe ) + (3 * Δ H° O₂ )]

The value for Δ H°(Fe₂O₃ ) = - 824.2kJ/mol

Δ H° Fe = 0

Δ H° O₂ = 0

Putting in the above equation ,

ΔH rxn = ( 2 * Δ H° (Fe₂O₃ ))  - 0

ΔHrxn =  2× - 824.2 kJ / mol = - 1648.4 kJ/mol

- 1648.4 kJ/mol  , this much heat is released by the buring of 4 mol of Fe.

Hence ,

for 1 mol of Fe ,

- 1648.4 kJ/mol  / 4 = 412.1kJ

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How many cups of beer are in a keg?
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Consider the following reactions. (Note: (s) = solid, (l) = liquid, and (g) = gas.) ½H2(g) + ½I2(g) → HI(g), ΔH = +6.2 kcal/mole
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½H2(g) + ½I2(g) → HI(g) ΔH = +6.2 kcal/mol
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A 50.0 mL sample of 12.0 M HCl is diluted to 200 mL. What is true about the diluted solution?
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The concentration of the solution reduces and the number of moles of solute isn't affected.

Data;

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1. When the solution is diluted, the concentration changes and this time, the concentration reduces.

Using dilution formula

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The concentration of the solution reduces.

2. The number of moles remains the same.

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