Question

1 During formation of NaCl, from Na(s) and Cl2(g), how many steps are endothermic
(a) Na(s) → Na(g)
(b) 1/2Cl2(g) → C1(9)
(C) Na(g) - e- → Na+(g)
(d) Clg) + e- → Cl-(g)
(e) Na+(g) + C1-(g) → NaCl(s) ​

Answer 1

Answer:

1 and 2 are correct I think

Answer 2

Answer:

The Correct Answers are:

(a) Na (s) -> Na (g)

(b) 1/2Cl2 (g) -> Cl (g)  

(c) Na (g) -> Na+ (g)

Explanation:

For Option (a),

Sublimation is the process of a substance transitioning directly from the solid to the gas phase without passing through the liquid phase in between. Sublimation is an endothermic reaction that takes place at temperatures and pressures below a substance's phase diagram's triple point.

Sublimation Enthalphy: 108kJ

For Option (b),

The bond dissociation energy (BDE or D0) is one measure of a chemical bond's strength. It can be defined as the standard enthalpy change when a bond is cleaved by homolysis at 0 K with the homolysis reaction's reactants and products (absolute zero).

Dissociation EnthalpyL 122kJ

For Option (c),

Ionization is the process by which an atom or molecule gains or loses electrons to produce ions, which is commonly done in conjunction with other chemical changes.

Ionization Enthalpy: 496kJ