Posted by kathren on Thursday, May 13, 2010 at 7:32pm.
This is a basic stoichiometry problem.
1. Write and balance the equation.
2AgNO3 + CaCl2 ==> 2AgCl + Ca(NO3)2
2. Convert what you have, in this case 45 g CaCl2, to moles. moles = grams/molar mass = 45/molar mass CaCl2 = ?? moles CaCl2
3. Using the coefficients in the balanced equation, convert moles of what you have (CaCl2) to moles of what you want (in this case moles AgCl).
??moles CaCl2 x (2 moles AgCl/1 mole CaCl2) = ??moles x (2/1) = xx moles AgCl
4. Now convert moles AgCl to grams. g = moles x molar mass.
180 AgCl?
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