Răspuns:
1
a)1 mol de Mg....24g Mg
2 moli de Mg....x g Mg
x=2×24=48g Mg
b) 1 mol de S....32 g S
0.1 moli S.......y g S
y=32×0.1=3.2 g S
2
a) 1 mol Al... 27g Al
x moli Al.....2.7 g Al
x=2.7:27=0.1 moli Al
b)1 mol Na....23 gNa
y moli Na.....46g Na
y=46:23=2moli Na
3
1 mol Ca....40 g Ca
x moli Ca.....10g Ca
x=10:40=0.25 moli Ca
1 mol Ca........6.022×10²³ atomi
0.25 moli Ca......x atomi
x=0.25×6.022×10²³
4
1 mol Ag....108g.....6.022×10²³atomi
x g.........1 atom
x=108:6.022×10²³
