Please help this is due today

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa