Ta có: nMg= \(\dfrac{2.4}{24}=0.1\left(mol\right)\)
PTHH: 2Mg +O2 ___\(t^o\)____> 2MgO (1)
0.1_______________> 0.1(mol)
Ta có: mMgO= 0.1 . 40=4(g)
PTHH: 2Mg + O2 ---to---> 2MgO.
Ta có: nMg=2,4/24=0,1(mol)
Theo PT, ta có: nMgO=nMg=0,1(mol)
=> mMgO=0,1 . 40=4(g)