The percent yield of indigo : 79.6%
Further explanation
Percent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
2C₁₀H₁₁NO₄ + 2H₂O → C₁₆H₁₀N₂O₂ + 2C₂H₄O₂ + 4H₂O
Actual yield = 1.87 g
Theoretical yield = 2.35 g
The percent yield of indigo :
![\tt \%yield=(actual)/(theoretical)* 100\%\\\\\%yield=(1.87)/(2.35)* 100\%=\boxed{\bold{79.6\%}}](https://img.qammunity.org/2021/formulas/chemistry/high-school/44ayo1vfkjzj4lplnx0yk2a08gnwk5dngs.png)