Which of the following equations can be used to determine the change in enthalpy of a system? a. `deltah_"reaction"=deltah_"products "×deltah_"reactants"` b. `deltah_"reaction"=deltah_"products "÷deltah_"reactants"` c. `deltah_"reaction"= deltah_"products"+deltah_"reactants "` d. `deltah_"reaction" = deltah_"products"−deltah_"reactants "`

The correct answer is Option D.

Explanation:

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as

The equation used to calculate enthalpy change is of a reaction is:  

Hence, the correct answer is Option D.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.

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