Úloha ID 2743 - 
V roztoku neznámé sloučeniny ve vodě, který má hmotnost 120 g, je 85 g vody. Jaký je hmotnostní zlomek neznámé sloučeniny v roztoku?
Správná odpověď je: C
Pro výpočet hmotnostního zlomku použijeme následující vzorec:
m(neznámé sloučeniny) = 120 – 85 = 35 g
W = m(neznámé sloučeniny)/m(celková) = 35/120 = 0,29.
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