1.W ile gramach Fe₂O₃ znajduje się 10g Fe?
2.W ilu molach H₂So₄ znajduje się 100g S?
3.Ile atomów Mg znajduje sie w 2g Mg?
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M(Fe₂O₃) = 2*56g/mol + 3*16g/mol = 160g/mol
M(Fe) = 56g/mol
160g Fe₂O₃ -------------- 2*56g Fe
xg ---------------------------- 10g
x = 14,3g
zad.2
M(S) = 32g/mol
1mol H₂SO₄ ---------------- 32g S
x mol ---------------------------- 100g
x = 3,125 mol
zad.3
M(Mg) = 24g
24g Mg ------------------ 6,022*10²³ atomów
2g ------------------------- x
x = 5,02*10²² atomów