Which chemical equation below does not illustrate the law of conservation of mass?

3lioh + fe(no3)3 --> 3lino3 + fe(oh)3

al4c3 + 12h2o --> 3ch4 + 4al(oh)3

2nacl + cao --> na2o + cacl2

2zn + 2hcl --> zncl2 + h2

In 2002, the rare earth elements mine in mountain pass, california was closed because

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

Tell me the iupac name of the following compounds: