Question

Ok, For Cup C
Mass of cup,water,stirrer: 55.15
Mass of sodium bicarbonate: 2.02g
mass of citric acid: 0.77g
total mass: 57.94g
mass of cup,solution, stirrer after reaction: 57.64
difference (CO2): 0.30g

Part B: Limiting Reactants
Plastic Cup C
7. Determine which reactant is the limiting reactant in the plastic cup C. Describe your reasoning.

You know I know how to calculate the TY and AY and %Y now, but I'm confused on the finding limiting reactant? umm Let me see if I can figure it out and you let me know if I'm on the right track...
2.02g NaHCO3 mols = 2.02/84 = 0.0240 mols
the ratio is 3/1 for NaHCO3toH3C6H5O7 so do I do 0.0240/3 = citric acid? 0.008 moles citric acid? so since citric acid is smaller but it requires 3 of sodium bicarbonate, would that be the limiting reactant? because it takes more of them? am I figuring this out right?

8. Calculate the theoretical yield of carbon dioxide in the plastic cup C.
2.02/84=0.0240 *44 = 1.056 TY??


9. Calculate the percentage yield in the plastic cup C.

AY = 0.30/1.056 TY = 0.284*100 = 28.4% ?? is this right?
Chemistry Dr. Bob222 - DrBob222, Wednesday, March 4, 2015 at 12:18am
You know I know how to calculate the TY and AY and %Y now, but I'm confused on the finding limiting reactant? umm Let me see if I can figure it out and you let me know if I'm on the right track...
2.02g NaHCO3 mols = 2.02/84 = 0.0240 mols
the ratio is 3/1 for NaHCO3toH3C6H5O7 so do I do 0.0240/3 = citric acid? 0.008 moles citric acid? so since citric acid is smaller but it requires 3 of sodium bicarbonate, would that be the limiting reactant? because it takes more of them? am I figuring this out right?

8. Calculate the theoretical yield of carbon dioxide in the plastic cup C.
2.02/84=0.0240 *44 = 1.056 TY??
!!!!!!HERE IS WHERE I AM WRITING NEW AGAIN!!!
*** So I should be saying 0.008/84 *44? = 0.42% or am I to use the citric acid mass of 192.1? 0.008/192.1 = 0.00042 * 44 ==0.0018 I'm even more confused now... And before I didn't have to calculate the limiting reagent it's just now asking me to.. I don't know.. ughhhhhh..

If citric acid is the LR then you should use it to determine the theoretical yield. This calls into question some of the earlier answers since I didn't check them for the LR bit. But it stands to reason that if 1 g NaHCO3 is equivalent to 0.76 g citric acid then if you start with 2.02 g NaHCO3 it will take more than 0.76 g citric acid and there isn't enough there to do anything except with 1g NaHCO3.

9. Calculate the percentage yield in the plastic cup C.

AY = 0.30/1.056 TY = 0.284*100 = 28.4% ?? is this right?
TY needs to be recalculated.

Answer 1

I think I must have answered this elsewhere.