Cupper (II) sulfate reacts with hydrogen iodide to produce copper iodide, sulfuric acid, and iodine gas. If 10.4g of copper (II) sulfate is used, calculate the number of grams of HI needed and the number of grams of each product produced.

Answer 1

2CuSO4 + 4HI ==> 2CuI + 2H2SO4 + I2

Here is an example stoichiometry problem I've posted. Just follow the steps, one to determine HI, and separately calculate grams of each product formed.
http://www.jiskha.com/science/chemistry/stoichiometry.html