I am trying to find the theoretical yeild of the balance equation:

CuSO45H20 + 4NH3-->[Cu(NH3)4]SO4 + 4H20

Moles of CuSO45H20 are .0063 and there were 1.570 grams

Moles of Ammonia used are .06 (I think) (total ml of ammonia added was 4 ml and molarity is 15M)

I know the limiting reagent is the copper sulfate but I dont know how to find the theoretical yield and the theoretical mass of product produced. The molar mass is 245.75 g/mol) and I need it in moles.

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Data

CuSO₄ x 5H₂O + 4NH₃ + H₂O -------> Cu(NH₃)₄SO₄ x H₂O + 5H₂O

8.0 grams of CuSO₄ x 5H₂O in a tared 125 mL Erlenmeyer Flask: 8.130 grams

Weight of Petri Dish: 32.578 grams

Whatman Paper -Paper #1 1.2669 grams -Paper #2 1.2668 grams

1. Calculate the theoretical yield of Cu(NH₃)₄SO₄ x H₂O (Molecular Weight: 245.7 g/mol) from the mass of the starting matterial, CuSO₄ x 5H₂O (Molecular Weight: 249.7 g/mol)

2. Calculate the percent yield of product

(experimental yield / theoretical yield) x 100

3. Calculate the theoetical percents of copper, ammonia, sulfate, and water from the formula, Cu(NH₃)₄SO₄ x H₂O

DATA FROM EXPERIMENT:

MASS OF WEIGHING PAPER = 0.3670 g
MASS OF WEIGHING PAPER + Al FOIL = 1.0000 g
MASS OF ALUM FOIL (NET WEIGHT OF ALUM) = 0.6330 g
MASS OF EMPTY 50 mL BEAKER = 29.3380 g
MASS OF BEAKER + ALUM CRYSTALS = 39.8840 g
MASS OF ALUM (NET WEIGHT OF ALUM) = 10.5460 g

we added about 35 mL of de-ionized water and 12mL of 6M KOHsolution to the beaker. I converted the molarity to moles and got6M KOH (.012 L) = .072 mol KOH

When metallic aluminum comes into contact with aqueous solutions ofstrong bases like potassium hydroxide, KOH, it reacts to formhydrogen gas and a salt containing both aluminum and potassiumions.

2 Al (s) + 2 KOH (aq) + 6 H2O (l) ? 2 KAl(OH)4 (aq) + 3 H2(g)

This salt, KAl(OH)4, is soluble in solutions of strong acids, suchas sulfuric acid, H2 SO4, and reacts to form aluminum hydroxide,Al(OH)3, and potassium sulfate, K2 SO4.

2 KAl(OH)4 (aq) + H2 SO4 (aq) ? 2 Al(OH)3 (s) + K2 SO4 (aq) + 2 H2O(l)

Excess sulfuric acid is required to dissolve the Al(OH)3, and toform aluminum sulfate, Al2 (SO4)3.

2 Al(OH)3 (s) + 3 H2 SO4 (aq) ? Al2 (SO4)3 (aq) + 6 H2O (l)

As this solution is cooled, the aluminum and potassium sulfatesalts crystallize out of the solution as the alum. The equationbelow shows only the ions and the water involved in thecrystallization process.

K+ (aq) + Al3+ (aq) + 2 SO4 2- (aq) + 12 H2O (l) ? KAl(SO4)2 * 12H2O (s)

MY QUESTION IS.. I DONT KNOW WHICH EQUATION TO USE TO CALCULATE THEPERCENT YIELD. SHOULD IT BE THE FIRST ONE SINCE IT IS BEFORE ANY OFTHE PROCEDURE WAS DONE? BUT FROM THE FIRST EQUATION, IT DID NOTPRODUCE THE ALUM CRYSTALS YET : KAl(SO4)2 * 12H20

EQUATION FOR PERCENT YIELD:
100 % x [mass of actual yield / mass of theoretical yield]

coffeeturtle150

Suppose you have a copper nitrate solid. You are not sure, however, if the solid is copper (I) nitrate, CuNO3, or copper (II) nitrate, Cu(NO3)2. You dissolve a 0.1015 gram sample of this solid in water and nitric acid and then dilute it to a final volume of 100. mL. You treat a sample of this solution with ammonia and then measure the absorbance of the resulting blue-violet solution. By comparing the absorbance of this solution to that of standard copper solutions you determine the concentration of Cu2+ to be 5.41 x 10-3 M. Use this information (and the hints below) to find the mole ratio of Cu : NO3 and determine the chemical formula for the original copper nitrate sample.1) Determine the total number of moles of Cu present in the original solid sample knowing that the solid was dissolved in enough water to make 100 mL of solution. Remember the molarity of this solution was experimentally determined using spectroscopy. 2) Calculate the mass of copper present in the original solid sample.3) Calculate the mass of nitrate ions present in the original solid sample of copper nitrate by mass difference.4) Determine the moles of NO3 present in the solid sample.5) Determine the Cu:NO3 mole ratio and figure out the chemical formula of the compound.Please label each part so I know what work goes with which part of the question.

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