1.which one of the following molecules would exhibit the gtreatest polarity?
A.CH4 B.CH3F C.CH2F2 D.CHF3 E.CF4
2.calculate the emf of the cell that utilized the reaction
2Co3+ +2H2O --->H2O +2H+ +2Co2+ E°=0.04V
at 298K when [Co2+]=0.50M [H+]=0.10M [H2O2]=0.65M [Co3+]=0.25M
A.-0.087V B.0.064V C.0.09V D.-0.064V E.-0.007V
3.draw the molecular geomertry and give approximate bone angle
NCS- 怎麼畫阿??
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