Question

CHM 2046 Refer to the Atom Ecenomy Lab fer atom ecenomy description and eqeatiens L Hydrogen bs a. important industrial chtnica. Cakali·a·m" percent of H PRE LAB cenverted te prodects and the H atem ecesomy ef beth re Reaction: CN4) a Mal percent of H converted from reactests te products. b. Atem ecosomy of reactiea Number of moles of 7 Tetel sumber of males 100-53. 2. Hew many grams of waste per 6g of Ha are preduced by the Steam Reforming Reaction?

Answer 1

a.as per reaction there are 6 reactant hydrogen atoms gives 6 product hydroden atoms

b.

The atom economy of a reaction is a theoretical percentage measure of the amount of starting materials that ends up as the 'desired' useful reaction products. Its sometimes referred to as atom utilisation.

methane + water ==> hydrogen + carbon monoxide

CH₄ + H₂O ==> 3H₂ + CO

atomic masses: C = 12, H = 1, O = 16

using formula masses gives the ratios gives

16 + 18 ==> (3 x 2) + 28

34 mass units of reactants ==> 6 mass units of useful product

Atom economy = 100 x 6 / 34 = 17.6%

c.

28g of waste is produce for 6g of H₂

so the 82.4% of waste toxic carbon monoxide must be dealt with in some way!

It seems a very inefficient process BUT ... hydrogen has very small molecular mass and 75% of the molecules are the desired product