2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) t
he δhf for fe2o3(s) = -824.3 kj/mole.
the δhf for al2o3(s) = -1675.7 kj/mole.
finish the equation.
δhrxn = [(1) ( kj/mole) + (2) ( kj/mole)] - [(1) ( kj/mole) + (2) ( kj/mole)]

ΔHrxn = [(1) -1675.5 ( kJ/mole) + (2) 0 ( kJ/mole)] - [(1) -824.3 ( kJ/mole) + (2) 0 ( kJ/mole)]

Explanation:

ΔHrxn = 2ΔHf (Al₂O₃)  - ΔHf (Fe₂O₃)

Remember that for pure elements in their standard state of temperature and pressure by definition their standard heats of formation are zero.

ΔHrxn = 2(-1675.7) - (-824.3) kJ/mol

ΔHrxn = 2527 kJ/mol

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation: