Mr(C4HO) = 12*4 + 1 + 16 = 65
Mr(Fe3O4) = 56*3 + 16*4 = 232
Mr(H2CO3) = 1*2 + 12 + 16*3 = 62
Mr(NH4NO3) = 14 + 1*4 + 14 + 16*3 = 80
Mr(Ag2SiO3) = 108*2 + 28 + 16*3 = 292
Mr(C4HO) = 12*4 + 1 + 16 = 65
Mr(Fe3O4) = 56*3 + 16*4 = 232
Mr(H2CO3) = 1*2 + 12 + 16*3 = 62
Mr(NH4NO3) = 14 + 1*4 + 14 + 16*3 = 80
Mr(Ag2SiO3) = 108*2 + 28 + 16*3 = 292