In a three-reaction system, the first two reactions are endothermic with AH values of AH1=101 kJ and AH2 = 358 kJ, respectively. If the final reaction is exothermic, what is the minimum value of AH3 that would make the overall reaction exothermic? Show your work and explain your reasoning very carefully.

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Explanation:

The total reaction when it comes to a three-reaction system can be endothermic, that is when two of the reaction is exothermic although it is very rare since the 2 exothermic reactions will have to be of smaller size combined H° than that of the endothermic reaction. If that action is absent then the reaction cannot be endothermic.

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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.