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1molの気体は22.4Lなので
44.8Lは2mol
1molは6.02×10^23個
つまりエタンが6.02×10^23個×2=12.04×10^23個あります。
エタン1個あたり水素原子は6個なので
12.04×10^23個×6=72.24×10^23個
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