Modelová Otázka ID 2762 - 
Jaká je relativní molekulová hmotnost plynné látky, která má při objemu 3 m3 hmotnost 5 340 g?
Správná odpověď je: B
Nejprve vypočítáme látkové množství z objemu, poté z látkového množství a hmotnosti vypočítáme molární hmotnost. Molární hmotnost v g/mol číselně odpovídá relativní molekulové hmotnosti. Musíme dosazovat ve správných jednotkách – hmotnost v gramech a objem v dm3. Výpočet provedeme následovně:
M = m/n = m/(V/Vid) = (m · Vid)/V = (5 340 · 22,414)/3 000 = 39,9.
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