75
102
56
Объяснение:
Mr(NaHCO3) = 14+1+12+16*3 = 75
w(o) = 48/75 * 100% = 64%
Mr( Al2O3) = 27*2+16*3=102
w(o)=48/102 = 47%
Mr(KOH)= 39+16+1=56
w(o)=16/56 = 29%
75
102
56
Объяснение:
Mr(NaHCO3) = 14+1+12+16*3 = 75
w(o) = 48/75 * 100% = 64%
Mr( Al2O3) = 27*2+16*3=102
w(o)=48/102 = 47%
Mr(KOH)= 39+16+1=56
w(o)=16/56 = 29%