Part A - Calculating ΔS∘ from Tabulated Entropies Using the standard molar entropies below, calculate the standard entropy change, ΔS∘ , for the "water-splitting" reaction at 298 K: 2H2O(l) → 2H2(g) + O2(g) Standard Molar Entropies of Selected Substances at 298 K Substance S∘ (J/mol⋅K) H2(g) 130.6 O2(g) 205.0 H2O(g) 188.8 H2O(l) 69.9 Using the standard molar entropies below, calculate the standard entropy change, , for the "water-splitting" reaction at 298 : Standard Molar Entropies of Selected Substances at 298 Substance () 130.6 205.0 188.8 69.9 326.4 J/K 265.7 J/K 163.2 J/K 88.5 J/K −326.3 J/K

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Write a balanced equation showing the formation of copper (ii) nitrite from its elements

What four properties do all waves have in common