リンPの原子量31,酸素Oの原子量16
リン3.1gは3.1÷31=0.1mol
3.1g→7.1g 酸素4.0g化合
酸素4.0gは4.0÷32=0.125mol
P:O2=0.1:0.125で反応
10倍 =1:1.25
4倍 =4:5
4P+5O2→P4O10
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