What enthalpy change accompanies the reaction 2Al(s) + 3H₂O(l) → Al₂O₃(s) + 3H₂(g)?

818.6 KJ/mol

Explanation:

2Al(s) + 3H2O(l) → Al2O3(s) + 3H2(g)

∆H=∆Hp-∆Hr

∆H=(1(∆HAl2O3)+3(∆HH2))-(2(∆HAl)+3(∆HH2O))

∆H=((-1676.0 KJ/mol)+3(0 KJ/mol))-(2(0 KJ/mol)+3(-285.8 KJ/mol))

∆H=-818.6 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".