Plemeniti metali

Submitted by Vuk Biljuric on Wed, 04/30/2014 - 15:34
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Od 1g zlata izvucena je zica duzine 3,5km.Koliko atoma zlata ima u 1km te zice?

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milicaradenkovic - Wed, 04/30/2014 - 15:44

n(Au)=m/*Mr=1/197=0.00508 mol

1 mol---------------------------6*10(23)

0.00508 mol-----------------------x

x=0.00508*6*10(23)/1=3.048*10(21) atoma Au

3.5 km-------------------------3.048*10(21)

1 km-----------------------------x

x=1*3.048*10(21)/3.5=8.71*10(20) atoma Au