Born haber cycle calculation
Im confused on 4 b (i) of this paper
https://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Topic-Qs/OCR-A/5-Physical-Chemistry-Transition-Elements/Set-F/Lattice%20Enthalpy%20&%20Born-Haber%20Cycles%201%20QP.pdf
So for the calculation, for atomisation of Fluorine i did 0.5*79 but this is wrong according to the markscheme. Can someone explain why we dont need to multiply it by 0.5 despite having 0.5 moles of F2. Thanks so much
https://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Topic-Qs/OCR-A/5-Physical-Chemistry-Transition-Elements/Set-F/Lattice%20Enthalpy%20&%20Born-Haber%20Cycles%201%20QP.pdf
So for the calculation, for atomisation of Fluorine i did 0.5*79 but this is wrong according to the markscheme. Can someone explain why we dont need to multiply it by 0.5 despite having 0.5 moles of F2. Thanks so much
Original post by fiftythree
Im confused on 4 b (i) of this paper
https://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Topic-Qs/OCR-A/5-Physical-Chemistry-Transition-Elements/Set-F/Lattice%20Enthalpy%20&%20Born-Haber%20Cycles%201%20QP.pdf
So for the calculation, for atomisation of Fluorine i did 0.5*79 but this is wrong according to the markscheme. Can someone explain why we dont need to multiply it by 0.5 despite having 0.5 moles of F2. Thanks so much
https://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Topic-Qs/OCR-A/5-Physical-Chemistry-Transition-Elements/Set-F/Lattice%20Enthalpy%20&%20Born-Haber%20Cycles%201%20QP.pdf
So for the calculation, for atomisation of Fluorine i did 0.5*79 but this is wrong according to the markscheme. Can someone explain why we dont need to multiply it by 0.5 despite having 0.5 moles of F2. Thanks so much
What is the definition of enthalpy of atomisation?
Original post by Pigster
What is the definition of enthalpy of atomisation?
the enthalpy change when 1 mole of gaseous atoms are formed from an element in its standard state under standard conditions. I see now. If 2 moles were formed we would multiply by 2 right?
Original post by fiftythree
the enthalpy change when 1 mole of gaseous atoms are formed from an element in its standard state under standard conditions. I see now. If 2 moles were formed we would multiply by 2 right?
To make LiF - you need 1 mol of F atoms, not 1/2 as your OP suggested.
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