関連ワード:  is o2 a compound element or mixture    is oxygen a compound element or mixture    is oxygen gas a compound element or mixture    is liquid oxygen a element compound or mixture    is oxygen o2 an element compound or mixture    is na2 o2 an element compound or mixture    is oxygen a compound element heterogeneous mixture or homogeneous mixture    is oxygen dioxide an element compound or mixture  
結果 : is o2 a compound element or mixture