C7H6O3 is the limiting reactant
Mass of C7H6O3 = 70.0 g
Mass of C4H6O3 = 80.0 g
The identity of the limiting reactant
In a chemical reaction, limiting reagent is the reactant which directly influences the amount of product formed. This is identified by calculating the number of moles of each reactant, the reactant with lower moles is the limiting reactant
Molar Mass of C7H6O3 = 126 g/mol
Molar Mass of C4H6O3 = 102 g/mol
Since moles if C7H6O3 is less than C4H6O3, the former is the limiting reactant
B) Salicylic acid
Explanation: i just took the test
Answer : The correct option is, (B) Salicylic acid
First we have to calculate the moles of salicylic acid and acetic anhydride.
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 2 moles of salicylic acid react with 1 mole of acetic anhydride
So, 0.507 moles of salicylic acid react with mole of acetic anhydride
The excess of acetic anhydride = 0.783 - 0.2535 = 0.5295 moles
That means the in the given balanced reaction, salicylic acid is a limiting reagent because it limits the formation of products and acetic anhydride is an excess reagent.
Hence, the limiting reagent is, salicylic acid.
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The balanced chemical reaction is C7H6O3 + C4H6O3 + 23/4O2 -> 11CO2 + 6H2O
Molar mass of C7H6O3 = 138 g/mol
Molar mass of C4H6O3 = 102 g/mol
70g C7H6O3 (1 mol C7H6O3/138g C7H6O3)(1 mol C4H6O3/ 1mol C7H6O3)(102g C4H6O3/1mol C4H6O3) = 51.74g C4H6O3
80g C4H6O3 - 51.74g C4H6O3 = 28.26g C4H6O3
There are 28.26g C4H6O3 left after reacting it with C7H6O3, therefore the limiting reactant is C7H6O3.
The limiting reactant is salicylic acid.
From the equation of reaction,
1 mole of acetic anhydride (C4H6O3) (102g) reacts with 2 moles of salicylic acid (C7H6O3) (276 g)
80 g of acetic anhydride would react with (80×276/102) = 216.5 g of salicylic acid
216.5 grams of salicylic acid that is required to react with 80 grams of acetic anhydride.
The available mass of salicylic acid is 70 grams which makes salicylic acid the limiting reactant.
Converting masses into moles:
In the reaction, 2 moles of are necessary to react with 1 mol of . Following this ratio:
We have only 0.5 mol of , i.e, we don't have enough amount of salicylic acid, therefore, this is the limiting reactant.