1.
a) SO2
M SO2= A S +2× A O =32+2×16=32+32=64
R masa = S:O = 32:32=1
b) MgO
M MgO = A Mg + A O = 24+16 = 40
R masa = Mg :O =24:16 = 6:4 = 3:2
c) P2 O5
M P2O5= 2× A P +5× A O =2×30+5×16 =60+80=140
R masa = P:O = 30:16 = 15:8
d) H 2SO4
M H2SO4 = 2× A H + A S + 4× A O =2×1+32+4×16= 2+32+64= 98
R masa = H:S:O = 2:32:16 = 1:16:8
2.
b) MgO
M MgO = A Mg + A O = 24+16 = 40
R masa = Mg :O =24:16 = 6:4 = 3:2
Eu propun :
Mg/O = 24/16=6/4=3/2
