17 kg of aluminium was produced from 51 kg of aluminium oxide (AI2,O3) by electrolysis. What was the
percentage yield? (A,: Al = 27,0 = 16.)

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.