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Dilithium is crucial to the propulsion system of some starships. Dilithium is fomred by the adhesion of two lithium atoms in the gas phase: `Li(g)+Li(g)toLi_(2)(g)` The enthalpy of formation of dilithium is not easily measurable by direct means. However, th following thermochemicalparameters are known. `DeltaH_(f)^(@)` of `Li_(g)=150kJ//mol` IE of `Li_(g)=5eV//"atom"[1eV//"atom"=100kJ//mol]` `BE` of `Li_((g))^(+)=130kJ//mol` `IE` of `Li_(2(g))=5eV//"molecule"` `[IE=` ionisation energy] `[BE=` bond energy] Q. What is `DeltaH_(f)^(@)` of `Li_(2(g))`?A. `130kJ//mol`B. `170kJ//mol`C. `270kJ//mol`D. `-270kJ//mol`

Answer» Correct Answer - A


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