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Calculati nr. atomilor din 400 de grame de Potasiu (K)

Răspuns :

MK=39g/mol

n=m/M=400/39=10,256 moli K

1 mol K.................6,023*10^23 atomi
10,256 moli K.............x atomi

x=6,023*10^23*10,256=