Question

1. CATI ATOMI DE CARBON SE GASESC IN 72 g CALCIU
2. CATI PROTOMI SE GASESC IN 2 MOLI DE SULF
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Answer 1

1. aflu nr.at C din 72gC--daca e gresit, este vina ta, ca nu ai scris corect tema

n(niu)C= m/A--> n= 72g/12g/mol= 6molC
1mol at...........................N,A=6,023X10²³atomi
6mol..........................................6x6.023x10²³atomi....................

2.Sulful are numarul atomic,in tabel,Z=16---> inseamna ca atomul are 16
electroni si 16 protoni
1mol at.S   CONTINE  6,023x10²³atomi
2mol at.S......................2X6,023X10²³atomi
1atom ,..contine ..16protoni
2x6,023x10²³atomi.......16x2x6,023x10²³protoni................

N,A este numarul lui Avogadro