what is limiting reaction of 2mol of AgNO3 and 2 mole of BaCI2 ?

Question

what is the limiting reaction if 2mol of AgNO3 and 2 mole of BaCI2 is taken for reaction

Answer 1

2AgNO₃(aq) + BaCl₂(aq) ==> 2AgCl(s) + Ba(NO₃)₂(aq) .. balanced equation

The balanced equation tells us it takes 2 mols AgNO₃ for each 1 mol BaCl₂. Thus, if you have 2 mols of each, the AgNO₃ will run out first, leaving 1 mol of BaCl₂ unreacted. The limiting reactant is AgNO₃.

For future problems of this nature, you can simply just divide the mols of each reactant by the corresponding coefficient in the balanced equation. Whichever value comes out less will represent the limiting reactant. For the current problem, this calculation would look like this...

For AgNO₃: 2 mol AgNO₃ / 2 = 1

For BaCl₂: 2 mol BaCl₂ / 1 = 2

Since 1 is less than 2, that tells us that AgNO₃ is the limiting reactant.