Roztok bromidu draselného obsahuje 20 g KBr a 100 g vody. Jaký je hmotnostní zlomek bromidu draselného?
Správná odpověď je: B
Pro výpočet hmotnostního zlomku použijeme následující vzorec:
W = m(KBr)/m(celková) = m(KBr)/[m(KBr) + m(voda)]
W = 20/(20 + 100) = 0,17.
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