Draw possible dot structures of PO4³- and NO43- that fulfill the octet rule. One structure is stable the other is not. Explain why one is stable and the other does not exist. Use the fact that nitrogen atom is smaller than phosphorous atom, and possible repulsion of the lone electron pairs on the oxygen atoms due to their closeness to explain why one structure exists and the other does not.

Determine the number of valence electrons in phosphoric acid (H₃PO₄) and then draw the corresponding Lewis structure (by following the octet rule on all atoms).

Based on the bond energies for the reaction below, what is the enthalpy of the reaction? HC≡CH (g) + 5/2 O₂ (g) → 2 CO₂ (g) + H₂O (g)

A certain element X forms two compounds with hydrogen, XH3 and X2H4 (H2X–XH2). The total bond enthalpies of XH3(g) and X2H4(g) are 846 kJ/mol and 1341 kJ/mol, respectively. What is the average bond enthalpy of the X–X bond?

Which statement best describes how many chlorine atoms are needed when making Barium chloride? 2 chlorine atoms are needed because each chlorine atom accepts one of bariums two valence electrons to obtain a full octet and makes chlorine a negatively charged anion. O1 chlorine atom is needed because chlorine accepts one electron from barium to obtain a full octet and makes chlorine a negatively charge anion. 1 chlorine atom is needed because chlorine accepts one electron from barium to obtain a full octet and makes chlorine a positively charged cation. 2 chlorine atoms are needed because each chlorine atom accepts one of bariums two valence electrons to obtain a full octed and makes chlorine a positively charged anion.

THIS is the equation N2H4 + O2 → N2 + H2O PLEASE HELP AND LOOK AT THE PICTURE FOR DATA  PLEASE HELP! I REALLY NEED HELP BECAUSE MY TEACHER HASENT TAUGHT ME HOW TO DO THIS PLEASE HELP!!!!!   Balance the equation (if not already balanced) Draw the models of the molecules in the equation, using Lewis structures, ball and stick models or something else that represents each of the atoms and how they are connected.  Identify bonds being formed or broken.  Use bond energy values from below to Calculate the overall energy of the reaction. Determine if the reaction is exothermic or endothermic. Draw a potential energy diagram showing the ∆H, reactants and products. Create one example of mass (g) to mass (g) stoichiometry problem.

Which of these molecules or ions has a violation of the octet rule (other than H)? CO H20 PCI5 Br2 NH3

Use average bond enthalpy values to calculate ΔrH for the following reaction: 2NH3 + 3Cl2 → N2 + 6HCl