Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation is given below.
C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2
(a) What mass of acetic anhydride is needed to completely consume 4.20 102 g salicylic acid?
g
(b) What is the maximum mass of aspirin (the theoretical yield) that could be produced in this reaction?
the equation is C7H6O3+C4H603---->C9H8O4+ HC2H3O2 and both a and be ask to be in grams but i don't get how to do it at all PLEASE HELP
You can follow the instructions in the attached step by step. This will give you theoretical yield.
http://www.jiskha.com/science/chemistry/stoichiometry.html
ok thanks but i still get stuck doing the theoretical yield can you please show me how to do this?
To solve this problem, we'll need to use the balanced equation for the synthesis of aspirin. The molar ratio between salicylic acid and acetic anhydride in the equation tells us how many moles of acetic anhydride are needed for every mole of salicylic acid.
The balanced equation is:
C7H6O3 + C4H6O3 -> C9H8O4 + HC2H3O2
(a) To find the mass of acetic anhydride needed to completely consume 4.20 * 10^2 g of salicylic acid, we'll follow these steps:
1. Determine the molar mass of salicylic acid (C7H6O3):
C = 12.01 g/mol
H = 1.01 g/mol
O = 16.00 g/mol
Molar mass of salicylic acid = (7 * C) + (6 * H) + (3 * O) = 138.12 g/mol
2. Convert the given mass of salicylic acid to moles:
Moles of salicylic acid = 4.20 * 10^2 g / 138.12 g/mol
3. Use the balanced equation to determine the moles of acetic anhydride needed:
According to the balanced equation, the molar ratio between salicylic acid and acetic anhydride is 1:1.
So, moles of acetic anhydride needed = Moles of salicylic acid
4. Convert the moles of acetic anhydride to mass:
Mass of acetic anhydride = Moles of acetic anhydride needed * Molar mass of acetic anhydride
(b) To find the maximum mass of aspirin that could be produced (the theoretical yield), we'll follow these steps:
1. Determine the molar mass of aspirin (C9H8O4):
C = 12.01 g/mol
H = 1.01 g/mol
O = 16.00 g/mol
Molar mass of aspirin = (9 * C) + (8 * H) + (4 * O) = 180.16 g/mol
2. Use the balanced equation to determine the moles of aspirin produced:
According to the balanced equation, the molar ratio between salicylic acid and aspirin is 1:1.
So, moles of aspirin produced = Moles of salicylic acid
3. Convert the moles of aspirin to mass:
Mass of aspirin = Moles of aspirin produced * Molar mass of aspirin
By following these steps, you can calculate the answers to both parts (a) and (b) of the question.