Question

The change in entropy, ASP, is related to the the change in the number of moles of gas molecules, Ang. Determine the change in the moles of gas for each of the reactions and decide if the entropy increases, decreases, or has little or no change. A. 2 H, (8) +0,(8) ► 2H, 0(1) The entropy, AS Ang = mol O decreases. has little or no change. O increases. B. CO(g) +3 H,(g) – CH (8) + H,(g) The entropy, Aspx Angas has little or no change. decreases. O increases. Student

Answer 1

Angas is the sum of the coefficients of the Prooducts minus the sum of the gaseous Coefficients gaseous reactants. of the When value of Angas is positive, the change in entropy A n increases. When value of angas is negative, the change in entroopy Ashan decreases. When value of angas is Zero, the change in entropy AS oth has little or no change. A) 2 H₂(g) + O2 (g) → 2 H₂O (1) Ingas = 0 - (2+1) = - 3 mol The entropy, 45 oxu (decreases B) co(g) + 3 H₂ (g) - CHA (g) + H₂ (9) angas = 2-(1+3) = -2 mol The enterropy, as ren decreases c) CHq (q) + 2O2(g) - CO2 (g) + 2 H₂O ce Ingas = -(1+2) = [-2 mol The entropy, Aspen (decreases) D) NH₃(g) + HCl (g) Nhq Cl (s) Angas = 0-(1+1) = [-2 mol The entropy, a sogen decreases]