if 25g AgNO3 react with 25g of BaCL2, how many grams AgCL will be produced

Question

aaronq · Answer

Write an equation for the reaction process (and balance it). Convert the reactants to moles, find the limiting reactant. Use the moles of the limiting reactant to find the moles produced.

Use the stoichiometric coefficients to find moles of AgCl produced. 
Set up a ratio using the species of interest, like so:

e.g. for a general reaction:

                      $\color{red}{a}A + \color{blue}{b}B$ $\rightleftharpoons$ $ \color{green}{c}C$

where upper case are the species (A,B,C), and lower case (a,b,c) are the coefficients ,

                     $\dfrac{n_A}{\color{red}{a}}=\dfrac{n_B}{\color{blue}{b}}=\dfrac{n_C}{\color{green}{c}}$

From here you can isolate what you need. 
For example: if you have 2 moles of B, how many moles of C can you produce?

solve algebraically:      $\dfrac{2}{\color{blue}{b}}=\dfrac{n_C}{\color{green}{c}}\rightarrow n_C=\dfrac{2*\color{green}{c}}{\color{blue}{b}}$
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To convert mass to moles, use the relationship:

                             $n=\dfrac{m}{M}$

        where, M=molar mass, m=mass, and n= moles.