1. Write the mathematical expression for the reaction quotient, Qc, for each of the following reactions: (a) N2(g)+3H2(g) ⇌ 2NH3(g) (b) 4NH3(g)+5O2(g) ⇌ 4NO(g) + 6H2O(g) (c) NH4Cl(s) ⇌ NH3(g) + HCl(g) (d) 2Pb(NO3)2(s) ⇌ 2PbO(s) + 4NO2(g) + O2(g) (e) S8(g) ⇌ 8S(g)

(a) Qc = [NH₃]² / [N₂] × [H₂]

(b) Qc = [NO]⁴ × [H₂O]⁶ / [NH₃]⁴ × [O₂]⁵

(c) Qc = [NH₃] × [HCl]

(d) Qc = [NO₂]⁴ × [O₂]

(e) Qc = [S]⁸ / [S₈]

Explanation:

The reaction quotient (Qc) is equal to the product of the concentrations (at any time) of the products raised to their stoichiometric coefficients divided by the the product of the concentrations (at any time) of the reactants raised to their stoichiometric coefficients. In only includes gases and aqueous species.

(a) N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g)

Qc = [NH₃]² / [N₂] × [H₂]

(b) 4 NH₃(g) + 5 O₂(g) ⇌ 4 NO(g) + 6 H₂O(g)

Qc = [NO]⁴ × [H₂O]⁶ / [NH₃]⁴ × [O₂]⁵

(c) NH₄Cl(s) ⇌ NH₃(g) + HCl(g)

Qc = [NH₃] × [HCl]

(d) 2 Pb(NO₃)₂(s) ⇌ 2 PbO(s) + 4 NO₂(g) + O₂(g)

Qc = [NO₂]⁴ × [O₂]

(e) S₈(g) ⇌ 8 S(g)

Qc = [S]⁸ / [S₈]

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.