The thermite reaction, used for welding iron, is the reaction of Fe3O4 with Al. 8 Al (s) + 3 Fe3O4 (s) ⟶ 4 Al2O3 (s) + 9 Fe (s) Δ H° = -3350. kJ/mol rxn. Because this large amount of heat cannot be rapidly dissipated to the surroundings, the reacting mass may reach temperatures near 3000. °C. How much heat (in kJ) is released by the reaction of 19.3 g of Al with 63.2 g of Fe3O4?

The amount of heat released by the reaction is -2395.25 kJ

Explanation:

To calculate the number of moles, we use the equation:

Given mass of aluminium = 19.3 g

Molar mass of aluminium = 27 g/mol

Putting values in equation 1, we get:

Given mass of = 63.2 g

Molar mass of = 231.5 g/mol

Putting values in equation 1, we get:

The given chemical equation follows:

By Stoichiometry of the reaction:

8 moles of aluminium reacts with 3 moles of

So, 0.715 moles of aluminium will react with = of

As, given amount of is more than the required amount. So, it is considered as an excess reagent.

Thus, aluminium is considered as a limiting reagent because it limits the formation of product.

To calculate the enthalpy change of the reaction, we use the equation:

where,

= amount of heat absorbed = ? J

n = number of moles of aluminium = 0.715 moles

= enthalpy change of the reaction  = -3350 kJ/mol

Putting values in above equation, we get:

Hence, the amount of heat released by the reaction is -2395.25 kJ

it is the most commonly accepted one

the answer is yes

it has kinetic energy

reason

an object has kinetic energy when you stop the force carrying it, the object will stay in motion.

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