1. A

    Actual Yield of Ethanol Help!

    I have a hw problem about calculating the actual yield of ethanol. The problem is, I am very confused and don't know where to start? The problem is: Calculate the actual yield of ethanol in grams. Use the volume of ethanol from the simple distillation and its percent by volume for this...
  2. C

    The yield of the reaction product

    Hello,people:) Check please answers of the exercises. Ex.1.40 g of zinc oxide was reduced by excess carbon. Determine the mass of the formed metal if the yield of the reaction product is 85%. Ex.2.490 g of a 20% solution of sulfuric acid was neutralized with slaked lime Ca (OH) 2, and 60.6 g of...
  3. N

    Limiting Reactant and Yield

    Incomplete combustion of the fuel in a poorly tuned engine can produce toxic carbon monoxide along with the usual carbon dioxide and water. In a test of an off-road motor-cycle engine, 1,00 L of octane(of mass 702g) is burned and it was found that 1,84 kg of carbon dioxide is produced. What is...
  4. B

    Theoretical Yield Ni + 2HCl yields NiCl2 + H2

    Hey All, I have the balanced equation of Ni (s) + 2 HCl (aq) -> NiCl2 (aq) + H2 (g) A.) If 12.0 moles of HCl were reacted, how many moles of Ni would be needed such that there was no excess? B.) What is the theoretical yield (in grams) of NiCl2 from reacting 12.0 mol HCl? C.) If 12.0 mol of...
  5. C

    Percentage/theoretical yield problem

    Question: Suppose you prepare a sample of aspirin by heating 10g of salicylic acid with an excess of acetic anhydride. You obtain 6.2g of pure aspirin. What is the percentage yield of this reaction? Hint: first calculate the theoretical yield. There are Lewis structure give of the reactants...
  6. J

    How would I calculate the Yield. Please Help

    4.00 g of carbon reacts with 4.00 g of oxygen gas as shown in the balanced chemical equation below. Calculate the yield for the reaction if 3.99 g of CO2 (44.0 g/mol) is isolated from the reaction. C(s) + O2(g) → CO2(g) I know the answer is 72.5% but how do you get to that answer.
  7. J

    Theoretical Yield Please Help!!!

    The reaction of 3.0 mol of hydrogen gas with excess fluorine gas produced hydrogen fluoride gas (20.01 g/mol) as shown in the balanced chemical equation below. Determine the theoretical yield in grams for this reaction. H2(g) + F2(g) → 2HF(g) I know the answer is 120 g but how do you get to...
  8. S

    Synthesis of Lidocaine percent yield question

    Calculate the overall percent yield of the synthesis to produce crude lidocaine. My total weight of crude lidocaine is 0.627g The limiting reagent in this reaction is diethylamine I believe. I used 7.5 mL of diethylamine (MW=73.1g/mol ; density= .71g/ml) 7.5mL*(.71g/mL)=...
  9. T

    Calculations involving moles and percentage yield

    Hello all! I'm just starting out on chemistry and I don't even know where I would begin with these questions: What volume of a 2.40 mol/L magnesium bromide solution would contain 3.40 x 10^23 atoms of bromine? The reaction of 2.0g of Br2 with 4.0g of F2 produced BeF5 in 45% yield. How many...
  10. S

    Theoretical Yield and Percentage Yield

    2.5 g of V2O5 was dissolved in 10mL of water, 5mL of H2SO4 and 15mL of ethanol. After being heated on a steam bath the solution was filtered and the filtrate was transferred to a 400mL beaker. 6.2 mL of acetylacetone was added and then the solution was neutralised by 10mL of Na2CO3. The product...
  11. brandonz

    Percent yield?

    This is the question.. If 4.0g of H2 are made to react with excess CO, how many grams of CH3OH can theoretically be produced according to the following equation? CO + 2H2 -> CH3OH Our teacher taught this to us today and we have a quiz on it tomorrow but I don't get it at all.. How do I start?
  12. E

    Stoichiometry help needed asap!

    52.8kg of sand is reacted w/ 25.8kg of C to produce 22.4kg of pure silicon. Determine the limiting reactant,theoretical yield, and percent yield for this process. I'm not necessarily asking for the answer here, just help as far as setting up the reaction map , it'll be greatly appreciated...
  13. S

    Percent yield, and mass of excess reactant. Help.

    Ok so the question goes: 15.825 g of nickel (iii) oxide and 4.734 g aluminum metal are heated to produce nickel metal and 2.85 g aluminum oxide. What percent yield of aluminum oxide? What is the mass of the excess reactant that remains unreacted so far i got the chemical formula which i...
  14. D

    percent yield

    question on chemistry test C6H12O6 yields C2H5OH + CO2 you have 100g of the sugar which yields 50ml of ethanol. density of ethanol is stated to be .789g/ml. what is the percent yield. i calculated it to be about 78%. ans is 34% my calculation gram molar wt of sugar is 180, ethanol is...
  15. H

    percentage yield

    A student heat 4g of Ca(NO3)2 for 15 min, after cooling mass of residue is 2.92g. How to calculate the percentage yield of CaO? the ans given is 41 %