To recieve full ratings and best answer please provide a full explanation for th
ID: 932363 • Letter: T
Question
To recieve full ratings and best answer please provide a full explanation for the following question: A 25.0 mL sample of 0.15 M silver nitrate, AgNO3, is reacted with a 3.58 g sample of calcium chloride, CaCl2 (M = 111.0). Which of the following statements is true?
(A)
Silver nitrate is the limiting reactant and calcium nitrate precipitates.
(B)
Silver nitrate is the limiting reactant and silver chloride precipitates.
(C)
Calcium chloride is the limiting reactant and calcium nitrate precipitates.
(D)
Calcium chloride is the limiting reactant and silver chloride precipitates.
To recieve full ratings and best answer please provide a full explanation for the following question: A 25.0 mL sample of 0.15 M silver nitrate, AgNO3, is reacted with a 3.58 g sample of calcium chloride, CaCl2 (M = 111.0). Which of the following statements is true?
(A)
Silver nitrate is the limiting reactant and calcium nitrate precipitates.
(B)
Silver nitrate is the limiting reactant and silver chloride precipitates.
(C)
Calcium chloride is the limiting reactant and calcium nitrate precipitates.
(D)
Calcium chloride is the limiting reactant and silver chloride precipitates.
Explanation / Answer
The Balance chemical reaction is as follows:
CaCl2(aq) + 2AgNO3(aq) --> 2AgCl(s) + Ca(NO3)2(aq)
Now calculate the number of moles of CaCl2 and AgNO3 as follows:
moles of AgNO3 :
25.0 ml *0.15 mol/ 1000 ml= 3.75*10^-3 mol
mol of CaCl2:
3.58 g / 110.98 g/mol=0.032 mol
Now calculate the moles of CaCl2 as follows:
3.75*10^-3 mol AgNO3 * 1 mol CaCl2/ 2 mol AgNO3
=1.875*10^-3 mol CaCl2
remaining mol of CaCl2 = 0.032 mol-1.875*10^-3 mol CaCl2
=0.030125 mol.
while AgNO3 is reacted fully
AgNO3is limiting agent due to following reasons:
Hence the correct answer is B
Silver nitrate is the limiting reactant and silver chloride precipitates.
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