1. MgО
w(О)= m(О) : Mr( MgO)
w(О)= 16(m(O) : 40 * 100%
w(O)= 0,4 або 40%
2. SO2
Mr ( SO2 ) = 32+16×2=64
32×1
w ( S ) = = 0,5 × 100% = 50%
64
16×2 32
w ( O ) = = = 0,5 × 100% = 50%
64 64
1. MgО
w(О)= m(О) : Mr( MgO)
w(О)= 16(m(O) : 40 * 100%
w(O)= 0,4 або 40%
2. SO2
Mr ( SO2 ) = 32+16×2=64
32×1
w ( S ) = = 0,5 × 100% = 50%
64
16×2 32
w ( O ) = = = 0,5 × 100% = 50%
64 64