Calculate the enthalpy change for the thermite reaction: 2al(s)+fe2o3(s)→2fe(s)+al2o3(s), δh∘rxn=−850 kj when 12.0 mol of al undergoes the reaction with a stoichiometrically equivalent amount of fe2o3. express your answer to three significant figures and include the appropriate units.

The enthalpy of the reaction for given amount of aluminium will be

Explanation:

We are given:

Moles of aluminium = 12 moles

For the given chemical reaction:

By Stoichiometry of the reaction:

If 2 moles of aluminium produces -850 kJ of energy.

Then, 12 moles of aluminium will produce = of energy.

Converting this into three significant figures, we get:

Thus, the enthalpy of the reaction for given amount of aluminium will be

a chemical reaction

explanation:

it means there are 3 atoms of oxygen