Mr(MgO) = 24 + 16 = 40
W(Mg) = Ar(Mg) *n / Mr(MgO) *100% = 24 *1 / 40 *100% =60%
W(O) = Ar(O) * n/ Mr(MgO) *100% = 16 *1 / 40 *100% = 40%
Mr(CuO) = 63,5 + 16 = 79,5
W(Cu) = Ar(Cu) *n / Mr(CuO) *100% = 63,5 * 1 / 79,5 *100% =80%
W(O) = Ar(O) *n / Mr(CuO) *100% = 16*1 / 79,5 *100% = 20%
Массовая доля кислорода меньше у CuO
Mr(MgO) = 24 + 16 = 40
W(Mg) = Ar(Mg) *n / Mr(MgO) *100% = 24 *1 / 40 *100% =60%
W(O) = Ar(O) * n/ Mr(MgO) *100% = 16 *1 / 40 *100% = 40%
Mr(CuO) = 63,5 + 16 = 79,5
W(Cu) = Ar(Cu) *n / Mr(CuO) *100% = 63,5 * 1 / 79,5 *100% =80%
W(O) = Ar(O) *n / Mr(CuO) *100% = 16*1 / 79,5 *100% = 20%
Массовая доля кислорода меньше у CuO
1) MgO
w1(o)= 16/40 *100%= 40%
w(Mg)= 24/40 *100%= 60%
2)CuO
w2(O)= 16/80 *100%=20%
w(Cu)= 64/80 *100%=80%
w2(CuO)<w1(MgO)