PLEASE HELP ME I CANT FAIL THIS EXAM In the following reaction, oxygen is the excess reactant.

SiCl4 + O2 → SiO2 + Cl2

The table shows an experimental record for the above reaction.

Experimental Record

Trial Starting Amount of SiCl4 Starting Amount of O2 Actual Yield of SiO2
1: 100 g, 100 g, 32.96 g

2: 75 g, 50 g, 25.2 g

Calculate the percentage yield for SiO2 for Trial 1. Also, determine the leftover reactant for the trial. Show your work.

Based on the percentage yield in Trial 2, explain what ratio of reactants is more efficient for the given reaction.

(8 points)

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."