1.oblicz masę 5 moli N2
2.ile moli zawartych jest w 90g glukozy
3.w ilu gramach wapnia jest tyle samo moli co w 14g żelaza
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M=14g/mol masa molowa N
1mol N2-28g bo 2 cząsteczki N
5moli N2- x
x=140g
glukoza C6H12O6=6*12u+12*1u+6*16u=180g/mol
1mol-180g
x moli-90g
x=2
M=56g/mol masa molowa Fe
1 mol Fe- 56gFe
x -14gFe
x=0,25 moli Fe
M=40g/mol masa molowa Ca
1mol Ca-40gCa
0,25moli Ca-x
x=10g
Mmolowa N2 = 2*14 = 28g/mol
5moli= 5*28=140.
3. Wapń- x moli
żelazo- 14 g
Mmolowa fe = 56g/mol
1 mol Fe - 56g
x moli - 14g
X=o.25m
Masa molowa Ca = 40
40g - 1 mol
x - o,25 mola
x =10g