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If you need to reverse the following reaction and multiply it by 2 in order for it to be an intermediate reaction in a Hes
law problem, what would be the final value for the enthalpy of reaction you use for this intermediate reaction?
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H2 +0.5 02 + H20, AH = -286 kJ
-286 kJ
286 kJ
-572 kJ
572 kJ
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Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

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