Home › NY Regents Chemistry › Chemistry › Chemical Bonding and Molecular Geometry › How much energy is needed to pull one mole of so…
How much energy is needed to pull one mole of solid sodium chloride apart into gaseous ions?
A436 kJ
B769 kJ
C243 kJ
D185 kJ
Answer & Solution
Correct answer: B. 769 kJ
1. Separating the lattice means overcoming every attraction between the ions at once.
2. For one mole of solid sodium chloride that costs 769 kilojoules.
3. The other values belong to covalent bonds, which are far weaker than a whole ionic lattice.
_Source: OpenStax Chemistry (CC BY 4.0), Chs 7 and 17, section 7.1 Ionic Bonding_
Related questions
An ionic formula such as Al2O3 does not tell you:For p-block elements forming cations, electrons are removed from which orbitals first?In a chlorine molecule, each chlorine atom ends up surrounded by how many electrons in totA monatomic anion typically forms when a nonmetal atom gains enough electrons to reach:The calcium ion Ca2+ is isoelectronic with which noble gas?When transition metals ionise, the electrons removed first come from the:Breaking the bonds in one mole of hydrogen molecules requires about:Most covalent compounds are poor conductors of electricity because they are: