A. 16.73g of CaCl2 is produced
B. CaCO3
C. Excess mass of CaCO3 is 12.93g
Explanation:
The balanced equation for the reaction.
CaCO3(s) + 2HCl(aq) —> CaCl2(aq)
+ H2O(l) + CO2(g)
A. Step 1:
Determination of the masses of CaCO3 and HCl that reacted from the balanced equation. This is illustrated below:
CaCO3(s) + 2HCl(aq) —> CaCl2(aq)
+ H2O(l) + CO2(g)
Molar Mass of CaCO3 = 40 + 12 + (16x3) = 40 + 12 + 48 = 100g/mol
Molar Mass of HCl = 1 + 35.5 = 36.5g/mol
Mass of HCl from the balanced equation = 2 x 36.5 = 73g
From the balanced equation above,
100g of CaCO3 reacted.
73g of HCl reacted.
A. Step 2:
Determination of the limiting reactant.
Let consider using all the 28g of CaCO3 to see if there will be any leftover for HCl.
From the balanced equation above,
100g of CaCO3 reacted with 73g of HCl.
Therefore, 28g of CaCO3 will react with = (28 x 73)/100 = 20.44g of HCl.
The mass of HCl obtained from the above calculation is far above the mass (11g) that was given in the question.
Now let us consider using all the 11g of HCl given from the question to see if there will be any leftover for CaCO3. This is illustrated below:
From the balanced equation above,
100g of CaCO3 reacted with 73g of HCl.
Therefore, Xg of CaCO3 will react with 11g of HCl i.e
Xg of CaCO3 = (11 x100) /73
Xg of CaCO3 = 15.07g
Now we can see clearly that there are leftover for CaCO3 as only 15.07g reacted out of 28g that was given.
Therefore, HCl is the limiting reactant and CaCO3 is the excess reactant.
A. Step 3:
Determination of the mass of CaCl2 produced from the balanced equation.
CaCO3(s) + 2HCl(aq) —> CaCl2(aq)
+ H2O(l) + CO2(g)
Molar Mass of CaCl2 = 40 + (35.5x2) = 40 + 71 = 111g/mol
From the balanced equation above,
111g of CaCl2 is produced.
A. Step 4:
Determination of the mass of CaCl2 that will be produced when 28g of CaCO3 combined with 11g of HCl.
CaCO3(s) + 2HCl(aq) —> CaCl2(aq)
+ H2O(l) + CO2(g)
From the balanced equation above,
73g of HCl produced 111g of CaCl2.
Therefore, 11g of HCl will produce = (11 x 111)/73 = 16.73g of CaCl2
B. From the calculations made above, CaCO3 is the excess reactant.
C. Determination of the excess mass remaining after the reaction.
The ecx reactant is CaCO3.
Mass of CaCO3 given = 28g
Mass of CaCO3 that reacted = 15.07g
Excess mass of CaCO3 = (Mass of CaCO3 given) - (Mass of CaCO3 that reacted)
Excess mass of CaCO3 = 28 - 15.07
Excess mass of CaCO3 = 12.93g
