In each row, pick the compound with the bigger lattice energy. Note: lattice energy is always greater than zero. Which compound has the bigger lattice energy? Li,0 Cs,0 CaF 2 KF Na Br NaI

Is the heat of Mg combustion equal to the heat of formation of MgO when both are measured at standard conditions? Provide an explanation to your Yes/No answer.

For which of the following four compounds is the lattice energy most exothermic? CsCl MgCl2 AlCl3 NaCl

The lattice energy is defined as the energy required to break one mole of an ionic solid into its ions in the gas phase. The lattice energy for calcium oxide corresponds to the following reaction. CaO(s) Ca2+(g) + O2-(g) DH = ? Using the following information, determine the lattice energy for calcium oxide. Ca(s) ----> Ca(g) DH = 178.2 kJ Ca(g) ----> Ca2+(g) + 2e-   DH = 1747.9 kJ O2(g) ----> 2O(g) DH = 498.3 kJ O2-(g) ----> O(g) + 2e- DH = -702 kJ Ca(s) + 1⁄2 O2(g) ----> CaO(s)   DH = -635.0 kJ   Using the unrounded answer from the previous problem determine q (kJ) for the following reaction when 1.00 grams of solid calcium oxide forms.     Ca2+(g) + O2-(g) ⟶⟶ CaO(s)

The Law of Conservation of Energy states, when applied to Calorimetry, states that heat is neither lost nor generated, but merely changes form during processes. Which of these calorimetry equations corresponds to that law?

Consider an internal combustion engine like that used in automobiles. The most common fuel used here is gasoline which is a mixture of hydrocarbons, and an octane rating is given for standardization. Therefore, we will approximate gasoline as being composed of the hydrocarbon, octane, C8H18. Another fuel that is common in racing applications is nitromethane, CH3NO2, used in top fuel dragsters. Let’s consider the combustion of each fuel with oxygen in an internal combustion engine. Let the 8-cylinder engine displacement be 500 in3 total. GOAL: Determine and compare the maximum enthalpy of reaction, ∆Ho rxn, for the combustion of both octane and nitromethane in a single cylinder of the engine. This means determine the maximum amount of fuel that can burn in the cylinder filled with 1 atm of air and the amount of heat that reaction would generate. Here are some suggested steps to guide you along. You will have to look up some data in your book or on the internet. 1. Write a balanced…

Given the reaction: ½ H2 (g) + ½ Cl2 (g) --> HCl (g)                ΔH = -92 kJ/mol What is the missing bond energy in kJ/mol?                                                 H - H      BE = 435 kJ/mol                                                 H - Cl     BE = 431 kJ/mol                                                 Cl - Cl     BE = ? kJ/mol? A) 96 B) 335 C) 188 D) 88 E) 243

Mm.46.

Based upon the equation below, what is the enthalpy change for 1.2 kg of H2O.

When 3.8 g A are reacted with 8.5 g D,  according to the balanced chemical equation below, 33 kJ of energy are released.  Please calculate the enthalpy for this reaction when 3 moles of G are produced.  2A + 3D = 2Z + 3G  given molar masses: A = 141.8 g/mole D = 63.996 g/ mole Z = 4.032 g/ mole G = 56.028 g/ mole