Avogadro's law relates the volume of a gas to the number of moles of gas when temperature and pressure are constant. According to this law, how
would the volume of a gas change if a reaction produced 3 moles of gas from
1 mole of gaseous reactants?

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

може ли да зареждате повече информация, моля

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.