Report all numeric answers to 3 significant figures. You...

Report all numeric answers to 3 significant figures. You placed the conical flask on the balance and tared to zero. You weighed out 3 g of salicylic acid, to 2.97 g. Thereafter you took your flask with the salicylic acid to the fume hood and dispensed ±3.5 mL of acetic anhydride. The accurate volume that you recorded was 3.46 mL. After adding the initial two reagents you returned to your tutor who added 3 drops of sulfuric acid to your flask. You calculate that you used moles of salicylic acid. You calculate that you used grams corresponding to moles of acetic anhydride. Your limiting reagent was . The maximum number of moles of aspirin that could be produced in your reaction was moles. The maximum mass of aspirin that could be produced in your reaction was grams. You obtained 2.66 g of crude aspirin. The yield for your reaction was %.

Transcript

00:01 So in this question, you're given a theoretical lab experiment where you measure out 2 .97 grams of sally silk acid.

00:11 You measure out three grams and then take more micro measurement and you get 2 .97.

00:15 You collect about 3 .5 millimeters of citacanhydrate and you find it's actually 3 .46 milliliters.

00:21 You then add three drops of h2s .o4 and you'll make aspirin.

00:26 And acetate, but acetate is just kind of a biproduct you don't really care about.

00:31 So, for now i mean abbreviates cellic acid as sa and a ck -hydrate as aa just for convenience.

00:42 This question leaves a lot out information -wise that you'll need.

00:47 And so you can look up these values or refine them.

00:51 Like you can solve it in molecular weight if you know the chemical formulas.

00:55 They're not included the question, so i just looked them up.

00:57 And so i put the molecular weights of each of the three compounds of care.

01:02 About, side of acid is 138 .12.

01:06 The cidicanehydrides is 102 .09.

01:09 Aspen is 180 .16 grams, and those are all grams per mole.

01:13 You also need the density of acetic and hydride, right, because you're measuring on milliliters and you need some way to convert that to grams.

01:19 And that's what density does.

01:20 And so the density of that, which you also have to look up or hope it's given somewhere else in the assignment, is 1 .082 grams per milliliter.

01:28 There's no way to find this without being given this value somewhere.

01:33 And so these will need in order to solve this question.

01:38 So part one, you're the first blank in your question is the moles of salicylicic acid.

01:50 And so this is just taking our grams of s .a.

01:57 And dividing it by the molecular weight, 138 .12 grams per one mole.

02:03 And we're dividing because we want the grams to cancel and left with just moles.

02:07 And we'll find we have 0 .0215 moles of s .a.

02:19 The second blank is asking about grams of acidate and hydrate, and this is where the density comes in.

02:27 And so we need to convert this milliliters, this 3 .46 milliliters into a gram density we actually care about, where it's 1 .082 grams per 1 milliliters.

02:40 Mill liters cancel...

Question

Please give Ace some feedback