Is Na+H20 -> H2+ NaOH a single replacement, Double Replacement or A Decomposition reaction

What is the percent by mass of oxygen in fe2o3

Which of the following is most likely true about water in chemical solutions?

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j