3) СH4
MgCl2
N2O3
H2S
4) Mr(NaCl) = 23+35,5=58,5
Mr(Ca(OH)2)=40 +16*2+1*2=74
Mr(H2SO3)=1*2+32+16*3=82
Mr(Fe2O3) =56*2+16*3=160
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3) СH4
MgCl2
N2O3
H2S
4) Mr(NaCl) = 23+35,5=58,5
Mr(Ca(OH)2)=40 +16*2+1*2=74
Mr(H2SO3)=1*2+32+16*3=82
Mr(Fe2O3) =56*2+16*3=160