Question

определить относительную молекулярную массу веществ

Answer 1

Mr (Cu2O) = 143, Mr(KNO3) = 101, Mr (Na2SiO3) = 122, Mr (H3PO4) = 98, 
Mr (Al2(SO4)3) = 342, Mr (H2SO4) = 98, Mr (K2S) = 110, Mr (Mg(OH)2 = 58,
Mr (SO3) = 80, Mr (CaCO3) = 100, Mr (H2SO3) = 82, Mr (NH4OH) =35, 
Mr (PO3) = 79, Mr (Zn(OH)2) = 99, Mr(H2SiO3) = 78, Mr(AlCl3) = 133,5