A barite composed of 100% BaSO4 is fused with carbon in the form of coke containing 6% ash...
A barite composed of 100% BaSO4 is fused with carbon in the form of coke containing 6% ash (which is infusible). The composition of the fusion mass is
Reaction:
BaSO4 + 4C → BaS + 4CO
Find the excess reactant, the percentage of the excess reactant, and the degree of completion of the reaction.
Step-by-Step Solution
The reactant which gets consumed in the process of the reaction earlier with respect to the other reactants is called limiting reagent or limiting reactant.
The molar mass of the compound is the sum of the atomic masses of all the atoms present in the compound.
Percentage of excess reactant with the ratio of the change in concentration of excess reactant with the initial concentration multiplied by 100.
Chemical reaction provided is as follows:
This implies, 
of 
reacts with 
of 
to produce 1 mole of 
and 
of 
.
Consider that the initial weight of the substance is 
.
Calculate the weight of each substance from weight percentages as follows:
For 
:
For 
:
For 
:
Now, calculate the moles of a substance as follows:
For 
:
For 
:
For C:
From the balanced chemical reaction provided above, 
of 
reacts with 
of 
to produce 1 mol of 
and 
of 
.
So, 
of 
required to form 
.
. 
So, 
of 
reacted with 
to produce 
.
Thus, the number of moles of C and 
are 
and 
.
But, the required moles of C and 
to form 
are 
and 
.
Thus, the limiting reactant is
and excess reactant is 
.
The expression used to find the percentage of excess reagent is as follows:
The initial moles of carbon are 
and reacted moles of carbon are 
.
Hence, the percent of excess reactant is
.
The expression used to find the value of degree of completion is as follows:
Hence, the degree of completion is
.
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