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2M+O2→2MO
M3.6g
MO6.0g
酸素が2.4g化合していることがわかる
O2=32g/molより
2.4÷32=0.075mol
反応式から酸素1molに対しM2mol反応する
Mは0.075×2=0.15mol
0.15molで3.6g
1molでは 3.6g÷0.15mol=24g/mol
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