4. C12H22O11
Mr(C12H22O11) = 12*12 + 22*1 + 16*11 = 144 + 22 + 171 = 337
W(C) = 144 / 337 = 42.7%
W(H) = 22 / 337 = 6.5 %
W(O) = 100 - 42.7 - 6.5 = 50.7 %
если надо округленно то w(C) = 43%, W(H) = 7%, W(O) = 50 % (+-)
5. Mr(H2S) = 1*2 + 32 = 34
Mr(SO3) = 32 + 16*3 = 80
Mr(Na2Co3) = 23*2 + 12+16*3 = 106
Mr(Cu(OH)2) = 64+16*2+1*2 = 98
Mr(P2O5) = 31 * 2 + 16*5 = 142
Mr(AlCl3) = 27+35.5*3 = 132.5
Mr(Ba(NO3)2 = 137 + 14*2 + 16*6 = 261
6. Mr(CO2) = 12+16*2 = 44
Mr(N2) = 14*2 = 28
Mr(CH2Cl2) = 12 + 1*2 + 35.5*2 = 84
Mr(NO) = 14+16 = 30
Mr(Co) = 12 + 16 = 28
Mr(C2H4) = 12*2 + 1*4 = 28
Mr(H2S) = 1*2 + 32 = 34
Mr(O2) = 32
одинаковые N2,CO,C2H4.
7. Mr(H2) = 2. Mr(SO2) = 32+32 = 64.
64:2 = 32
в 32 раза