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a fost răspuns

cati atomi sunt prinsi in:
a) 78 gr potasiu;
b)72 gr mg

Răspuns :

Ralucagabi
a)
1 mol....39g K....6,022×10^23 atomi
...............78g K....x atomi
x=(78×6,022×10^23)/39
x=12,044×10^23 atomi K
b)
1 mol...24g Mg...6,022×10^23 atomi
.............72g Mg.....y atomi
y=(72×6,022×10^23)/24
y=18,066×10^23 atomi Mg