4.1 Lattice Enthalpy Exam Questions With Correct Answers.

first ionization energy - The energy required to convert one mole of gaseous atoms into gaseous atoms with a single positive charge standard enthalpy of formation - the enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions Standard Enthalpy of Atomisation - The enthalpy change when one mole of gaseous atoms is formed from an element in its standard state Lattice enthalpy - The enthalpy change that occurs when one mole of a solid ionic compound is separated into its gaseous ions Formation equation of Magnesium Oxide - Mg(s) + 1/2 O2(g) => MgO (s) The lattice enthalpy of calcium chloride is +2237 kJmol-1. The enthaply of hydration of calcium ions is - 1650 kJ mol-1 and of chloride ions is -364 kJmol-1. What is the enthallpy of hydration of Calcium chloride? - -141 kJmol-1 The first ionisation energy of caesium - Cs (g) => Cs+ (g) + eEnthalpy of formation of caesium choloride - Cs(s)+ 1/2 Cl2(g)→CsCl(s) First electron affinityof chlorine - Cl(g) + e- → Cl-(g) lattice energy of caesium chloride - Cal(s) => Cs+(g) + 1/2 Cl- (g) First ionisation energy of Cs = +380 Enthalpy of atomisation of Cs = +78Enthalpy of formation of CsCl = -433 Enthalpy of atomisation of Cl = +122 First electron affinity of Cl = -364 Calculate lattice enthalpy ? - +649kJ mol -1