Calculate the enthalpy change for the thermite reaction: 2al(s)+fe2o3(s)→2fe(s)+al2o3(s), δh∘rxn=−850 kj when 10.0 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.

Enthalpy change when 10.0 moles of aluminium reacts with stoichiometrically equivalent ferric oxide is .

Explanation:

Energy change of the reaction when 2 mole of aluminium reacts with 1 mol of ferric oxide :

Energy change of the reaction when 1 mole of aluminium reacts :

Enthalpy change when 10.0 moles of aluminium reacts with stoichiometrically equivalent ferric oxide:

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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