Question 6291

4 pages
1 downs
30 views

Extension: PDF

Please download to get full document.

View again

of 4
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Share
Description
Hire A Tutor For Your Homework www.helpingtutors.com Alternatevely contact me for it's solution at flat rate of $20 licservernoida@gmail.com1) An unknown gas, X2(g),…
Transcript
Hire A Tutor For Your Homework www.helpingtutors.com Alternatevely contact me for it's solution at flat rate of $20 licservernoida@gmail.com1) An unknown gas, X2(g), which behaves much like N2(g) (N≡N), is analysed and the following enthalpies of formation are obtained:Gas ∆H°f X(g) 474 kJ/mol H(g) 217 kJ/mol X2H4(g) -23 kJ/mol We also know that the X-H bond energy is 417 kJ/mol. Use this information to estimate the X-X (single-)bond energy in the X2H4 molecule. Give your answer to the nearest 1 kJ/mol. 2) Suppose a chemist discovers a new metallic element and names it "Xegeum" (Xg). Xg exhibits chemical behaviour similar to an alkaline earth. Xg(s) + Cl2(g) → XgCl2(s) Lattice energy for XgCl2 -2060 kJ/mol First Ionization energy of Xg 490 kJ/mol Second Ionization energy of Xg 882 kJ/mol Electron affinity of Cl -348.7 kJ/mol Bond energy of Cl2 239 kJ/mol Enthalpy of sublimation (atomization) of Xg 160 kJ/mol Use the above data to estimate ΔH°f for Xegeum chloride.3) For each pair, indicate which would have the lattice energy of lesser magnitude. MgS MgSe SrO NaI BaO SrO CaTe CaO NaBr NaI 4) Coulomb's Law yields an expression for the energy of interaction for a pair of point charges.V is the energy (in J) required to bring the two charges from infinite distance separation to distance r (in nm). Q1 and Q2 are the charges in terms of electrons. (i.e. the constant in the above expression is 2.31×10-19 J nm electrons-2)For a group of "point" charges (e.g. ions) the total energy of interaction is the sum of the interaction energies for the individual pairs. Calculate the energy of interaction for the arrangement of ions shown in the diagram below. d = 0.535 nm.5) Order each of the following sets of five atoms and ions according to decreasing size.(i.e. "1" largest and "5" smallest) Mg2+ Br- P Cs N6) Consider the following statements and determine which are true and which are false.NO3- has only two resonance Lewis structures. - Selenium tetrafluoride (SeF4) is a non-polar molecule. - The formal charge on an atom in a molecule (or molecular ion) can be calculated as: (the number of valence electrons on a free atom) minus (half the number of electrons in bonds to that atom) minus (the number of unshared electrons assigned to the atom in the molecule) KrF4 has a tetrahedral structure. - Silane (SiH4) is a polar molecule. - KrF4 is a non-polar molecule.Hire A Tutor For Your Homework www.helpingtutors.com Alternatevely contact me for it's solution at flat rate of $20 licservernoida@gmail.com
Related Search
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks