Unformatted text preview: 6 Safari File Edit View History Bookmarks Window Help LE'F L: G $ $1: 50%[1uSatFeh211ﬂ2AM (1 EE ﬂ aseureataksecrn Gan Chem A}: Anteohanism is a sequence of elementary reactions that and up to the net or overall reaction that's ”mm-inn. R.
actually observed. For lldlﬂml moan,
III your “but: In this case. you‘ve been given only the ﬁrst step of a proposed two-step mechanism. You can construct
a reasonable second step by remembering that the two Steve must add up to the overall reaction: Section 15.6: Reaction
H2m+2NOm —) Nzor.)+H20(,; Step1 mum“ + ?4)? Step2 ZHszrZNOm 4) 2H20(9)+N2ie) Dverallreeclion You can see one thing Step 2 should include is 1 moleculeol H2 among its reactants and 1 molecule at N2 and 1 molecule of H20
among its products. That will make sure the reactants and products ofthe two steps add up to the reactants and products of the overall
reaction: H2[g)+ZNO(.) 4) N20(g)+HZO(9} Step1 + H2m+r —) NE(2)+H20M+? em ZHEHJ‘FZNOQ) —) 2H20(9)+N2ln) Overallreaction The only remaining problem is the presence of N20 among the products of Step 1. Since this species doesn‘t appear in the reactants or
products at the overall reaction it must be an intermediate. ltwill need to be consumed by step 2: H2[g)+ZNO(.) a NQO(.)+HZO(2} Step1
+ H2m+N20M —) N2M+H20m Step2 ZHEUJ +340“) —) 2H20(9) +N2ie) Overall reaction
Nawthe N20 pmducedby Step 1 isconswnedhyStepz As a check, notice thatthe chernical equation tor Step 2 is balanced, and that there are 2 molecules on its reactant side (1 molecule 01
H2 and 1 molecule of N20 ), which means Step 21s himolecular, as you were told it should be. +N20m —>N2(91+H20(:) ...
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