Question

What is the mass of S2Cl2 if 342 grams of S8 is reacted with an excess of Cl2?

Answer 1

What is the percent yield of a reaction in which 240. g phosphorus trichloride reacts with excess water to form 142 g HCl and aqueous phosphorus acid?

Answer 2

See the link for an example problem. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 3

You will get faster service if you post your own question by going to the top of the page rather than piggy backing on another post. In this case, however, just follow the response to Jennifer's question.