I need these two questions answered will give Brainliest for them!! Combination of ∆H1, ∆H2, and ∆H3 needed (using Hess’s law):
The published value for this reaction is –603 kJ/mol. What is the percent error of your experimental value?

Hairy thick gross thing? idk

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

I'm sorry i cant you if you don't list the elements : (