For each of the following precipitation reactions, calculate how many grams of the first reactant are necessary to completely react with 17.5 of the second reactant.

To calculate the number of grams of the first reactant necessary to completely react with 17.5 grams of the second reactant, we need to know the balanced chemical equation for the precipitation reaction. With the balanced equation, we can determine the stoichiometric ratio between the two reactants and use it to convert from grams of one reactant to grams of the other.

Please provide the balanced chemical equations for the precipitation reactions you want to calculate.

Here is a worked example of a stoichiometry problem. Just follow the steps.

http://www.jiskha.com/science/chemistry/stoichiometry.html