In all three cases, there are ionic bonds between metals (Li, Al and K) and nonmetals (Br, I, Cl). Covalent bonds occur between two non-metal compounds (example H20, NH3, among others)
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fe 55.85 g/mol and h2o 18.02 g/mol.
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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.
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