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246 Chapter 12 Solids and Modern Materials Data Interpretation and Analysis 12.105 (a) Metals with one oxidation state, either +1, +2, or +3, seem to be capable of forming metal hydrides of the form MH, MH₂, or MH₃. Metals with variable oxidation states are less likely to form metal hydrides. (c) Mg 24.31 amu X 0.75 = 18.23 amu Nb 92.91 amu X 0.25 = 23.23 amu H 1.008 amu X 2 = 2.016 amu 43.476 amu 2.02 amu %H by mass = X 100% = 4.64% H by mass 43.48 amu (e) All of the metal hydrides listed in Figure b would have to be heated to release the hydrogen. Forming a metal hydride releases heat in an exothermic reaction. Decomposing a metal hydride requires an input of energy since it is an endothermic reaction. This means the hydride needs to be heated for the reaction to occur. Copyright © 2017 Pearson Education, Inc.