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Jumlah partikel itu sama dengan jumlah molekul.1.
Mol = massa ÷ Mr = 10 ÷ 18 = 5/9
Jumlah molekul = mol x bilangan avogadro = 5/9 x 6 x 10^23 = 3,34 x 10^23
2.
Jumlah molekul = massa/Mr x bil. Avogadro
5 = massa/60 x 6 x 10^23
5 = massa x 10^22
Massa = 5/10^22 = 5 x 10^-22
3.
Volume pada STP = massa/Mr x 22,4
2,8 L = 3,5/Mr x 22,4
Mr = 3,5 x 22,4 ÷ 2,8 = 28 gram/mol