Show the calculation of (1) the expected grams of aspirin (C9H8O4) formed in the reaction of 2.7 grams of salicylic acid (C7H6O3) with excess acetic anhydride and then show the calculation of (2) the % yield if the actual yield of aspirin is 1.44 grams. Reaction is shown below:

Sorry i scrolled down there is no reaction. i need help with these four questions

To calculate the expected grams of aspirin formed in the reaction, we need to use stoichiometry. The balanced equation for the reaction of salicylic acid with acetic anhydride to form aspirin and acetic acid is:

C7H6O3 + (CH3CO)2O -> C9H8O4 + CH3COOH

From the balanced equation, we can see that 1 mole of salicylic acid (C7H6O3) reacts with 1 mole of acetic anhydride ((CH3CO)2O) to produce 1 mole of aspirin (C9H8O4). Therefore, we need to convert the given mass of salicylic acid into moles, and then use the stoichiometry to calculate the expected mass of aspirin.

(1) Calculation of the expected grams of aspirin formed:
1. Convert mass of salicylic acid to moles:
- Find the molar mass of salicylic acid (C7H6O3):
C: 12.01 g/mol x 7 = 84.07 g/mol
H: 1.01 g/mol x 6 = 6.06 g/mol
O: 16.00 g/mol x 3 = 48.00 g/mol
Total molar mass = 84.07 g/mol + 6.06 g/mol + 48.00 g/mol = 138.13 g/mol

- Use the given mass of salicylic acid and the molar mass to find the number of moles:
Moles of salicylic acid = Given mass / Molar mass
= 2.7 g / 138.13 g/mol
≈ 0.0195 mol

2. Use the stoichiometry to calculate the expected moles of aspirin:
From the balanced equation, we know that 1 mol of salicylic acid reacts to produce 1 mol of aspirin. So, the number of moles of aspirin expected is also 0.0195 mol.

3. Convert the moles of aspirin to grams:
- Find the molar mass of aspirin (C9H8O4):
C: 12.01 g/mol x 9 = 108.09 g/mol
H: 1.01 g/mol x 8 = 8.08 g/mol
O: 16.00 g/mol x 4 = 64.00 g/mol
Total molar mass = 108.09 g/mol + 8.08 g/mol + 64.00 g/mol = 180.17 g/mol

- Use the number of moles of aspirin and molar mass to find the expected mass:
Mass of aspirin = Moles of aspirin x Molar mass
= 0.0195 mol x 180.17 g/mol
≈ 3.51 grams

Therefore, the expected mass of aspirin formed in the reaction is approximately 3.51 grams.

(2) Calculation of the percentage yield:
Percentage yield is calculated by dividing the actual yield by the expected yield, then multiplying by 100 to express it as a percentage.

Percentage yield = (Actual yield / Expected yield) x 100

Given: Actual yield = 1.44 grams
Expected yield (from previous calculation) = 3.51 grams

Percentage yield = (1.44 g / 3.51 g) x 100
≈ 41.02%

Therefore, the percentage yield of the reaction is approximately 41.02%.