Consider an ionic compound, MX, composed of generic metal M and generic, gaseous halogen X.
• The enthalpy of formation of MX is AH = -467 kJ/mol.
• The enthalpy of sublimation of Mis AH sub = 135 kJ/mol.
• The ionization energy of Mis IE = 411 kJ/mol.
• The electron affinity of X is AHEA = -339 kJ/mol. (Refer to the hint).
• The bond energy of X, is BE = 241 kJ/mol.
Determine the lattice energy of MX.
AHLattice =
457.5
kJ/mol

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

1 a

2 d

3 a

4 c

explanation: