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Răspuns :

Moonlight01
a) MS=32kg/kmol

n=m/M=3,2/32 = 0,1 kmoli S = 100 moli S

1 mol S........................6,022*10^23 atomi S
100 moli S.....................x=6,022*10^25 atomi S

b) 1 mol Ca........................6,022*10^23 atomi
4,25 moli Ca.......................x = 2,55935*10^24 atomi

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