What is the percent yield when 79.0 g of C7H6O3 is added to an excess of C4H6O3 and produce 86.1 g of C9H8O4?

Aspirin, acetylsalicylic acid (C9H8O4), is produced by the reaction of salicylic acid (C7H6O3) and acetic anhydride (C4H6O3) according to the following: C7H6O3 + C4H6O3 → C9H8O4 + CH3COOH If 104.8 g of salicylic acid and 110.9 g of acetic anhydride are combined, calculate the percent yield of the reaction if 105.6 g of aspirin is produced. Blank 1 %

In the following reaction, 67.8 g salicylic acid, C7H6O3, reacts with excess acetic anhydride, C4H6O3, producing 31.3 g of aspirin, C9H8O4. Calculate the percent yield of this reaction.

1) Aspirin (C9H8O4) is synthesized by mixing salicylic acid (C7H6O3) with excess acetic anhydride (C4H6O3). The balanced equation is:

C7H6O3 + C4H6O3 ------------> C9H8O4 + C2H4O2

Molar mass/ g.mol^-1

C2H4O2 60

C4H6O3 102

C7H6O3 138

C9H8O4 180

When 2.0g of salicylic acid is mixed with excess acetic anhydrude, 1.7g of aspirin is collected . What is the percent yield for this reaction?

2) Starting with 4.3 L if 0.58 M Na2CO3(aq) what volume of this solution is needed to prepare 250 mL of 0.20 M Na2CO3(aq) solution?

3) If 26.32 mL of .100 M H2SO4 is exactly neutralized by 34.56 of NaOH solution, what is the molar concentration?

4) A solution is prepared by dissolving 3.422g of Al2(SO4)3, molar mass 342.2 g.mol^-1, in water to obtain 0.100 L of solution. What is the molar concentration of sulfate ion in this solution?

Please explain! Step by step if possible! Thank you!