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Verified answer
1. Mol = jmlh partikel/bil. Avogadro= 3,01 x 10^23 / 6,02 x 10^23
= 0,5 mol
2. Mol = massa/mr O2
= 4.48/32
= 0,14 mol
3. Volume = mol x stp
= 2 mol x 22,4
= 44,8 l