HW 4 - 4-1F corresponds to the charge passed to deposit one...

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Unformatted text preview: 4-1F corresponds to the charge passed to deposit one mole of monovalent element ata cathode. As one mole contains Avogadro’s number of atoms,e=96 500 C6.02×1023=1.60×10−19C.4-2(a)Total charge passed =i*t=1.00 A( )3600 s( ) =3 600 C. This is3 600 C1.60×10−19C=2.25×1022electrons.As the valence of the copper ion is two, two electrons are required to depositeach ion as a neutral atom on the cathode.The number of Cu atoms =number of electrons2=1.125×1022Cuatoms.(b)So the weight (mass) of a Cu atom is: 1.185 g1.125×1022atoms=1.05×10−22g.(c)m=qmolar weight96 5002( )ormolar weight=m96 500( )2q=1.185 g( )96 500 C( )23 600 C=63.53 g.4-3Thomson’s device will work for positive and negative particles, so we may applyqm≈VθB2ld.(a)qm≈VθB2ld=2 000 V( )0.20 radians4.57×10−2T( )20.10 m( )0.02 m( ) =9.58×107C kg(b)As the particle is attracted by the negative plate, it carries a positive charge and isa proton....
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HW 4 - 4-1F corresponds to the charge passed to deposit one...

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