ΔG°rxn=ΔH°rxn– TΔS°rxn=–2686 kJ–(298 K)(l kJ/1000 J)(–454.1 J/K) =–2551 kJYou get 1 point for the work and 1 point for the answer.Total your points and subtract one point if all reported answers did not have the correct number of signif-
icant figures.Question 4.
The silver cation accepts a pair of electron from the ammonia, making the silver ion the Lewis acid.You get 1 point for the correct formulas for the reactants and products, and 1 point for the correct
coefficients in the balanced equation. Answering the associated question correctly is worth 1 point.There will be 11 moles of product formed if 1 mole of pentanol reacts.You get 1 point for the correct formulas for the reactants and products, and 1 point for the correct
coefficients in the balanced equation. Answering the associated question correctly is worth 1 point.The ammonium chloride (or ammonium ion) is the limiting reactant.You get 1 point for the correct formulas for the reactants and products, and 1 point for the correct
coefficients in the balanced equation. Answering the associated question correctly is worth 1 point.Question 5.
(a) 1. Samples of primary standard sodium oxalate are weighed into beakers, and deionized water is added
to dissolve each of the samples. 2. A buret is rinsed with the potassium permanganate solution and then
filled. 3. The potassium permanganate solution is titrated into the oxalate sample until a permanent
pink color from the permanganate solution appears.All three of these will get you 2 points. One or two of these will get you 1 point. Other items, such as
heating the oxalate solution before the titration, are not needed.(b) (gram sample)[(1 mol Na 2 C 2 O 4 /134 g)][(2 mol MnO 4 – /5 mol C 2 O 4 2–)] [(1/L MnO 4 – added)]This entire setup will get 2 points (the 134 is optional). You get 1 point if you miss a step.(c) Percent sodium oxalate =(grams sodium oxalate/grams sample) ×100% You get 1 point for this
answer.(d) If the primary standard was not dried, the sample would contain less sodium oxalate than indicated by
the mass. The calculated concentration of the potassium permanganate solution would be too low. This
item is worth 1 point.A low concentration for the potassium permanganate solution would yield a low percentage of sodium
oxalate in the sample. This item is worth 1 point.(e) Hydrochloric acid reacts with permanganate ion. This answer is worth 1 point.Total your points for the various parts. There are 8 possible points.(c) NH 4 +–+→+OH NH 32 H O(b) 2C H OH 15O 511 +→ + 2 10CO 12H O 2 2(a) 2 NH 33 +→AgCl [Ag(NH ) ] 2 +–+Cl342 STEP 5. Build Your Test-Taking Confidence