1) When you measured out one mL of the trans-1,2-dibenzoylethylene in ethyl acetate solution it had...
1) When you measured out one mL of the trans-1,2-dibenzoylethylene in ethyl acetate solution it had a mass of 0.890 grams. (0.050 g of yellow solid and rest of it is Ethyl acetate). The forerun of ethyl acetate had a mass of 0.075g and the rest of the ethyl acetate collected had a mass of 0.253 g. The trans-1,2-dibenzoylethylene had a mass of 0.046 g. What is the percent recovery of each of the materials?
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1) When you measured out one mL of the
trans-1,2-dibenzoylethylene in ethyl acetate solution it had...
You mix a 25.0 mL sample of a 20 M potassium chloride solution with 20.0 mL...
You mix a 25.0 mL sample of a 20 M potassium chloride solution with 20.0 mL of a 0.900 M lead(II) nitrate solution, and this precipitation reaction occurs: (5 pts) 2KCl (aq) + Pb(NO3)2 (aq) ® PbCl2 (s) + 2KNO3 (aq) You mix a 25.0 mL sample of a 20 M potassium chloride solution with 20.0 mL of a 0.900 M lead(II) nitrate solution, and this precipitation reaction occurs: (5 pts) 2KCl (aq) + Pb(NO3)2 (aq) ® PbCl2 (s) +...
A 12.34 mL solution with an unknown salt concentration had a mass of 10.25 g. When...
A 12.34 mL solution with an unknown salt concentration had a mass of 10.25 g. When the water was evaporated from the solution. 4.78 g of NaCl remained. a Calculate the mass-mass percent NaCl concentration in the solution. Show your work. b Calculate the mass-volume percent NaCl concentration in the solution. Show your work. Calculate the molarity of NaCl in the solution. Show your work.
You mix a 25.0 mL sample of a 1.20 M potassium chloride solution with 20.0 mL...
You mix a 25.0 mL sample of a 1.20 M potassium chloride solution with 20.0 mL of a 0.900 M lead(II) nitrate solution, and this precipitation reaction occurs: (5 pts) 2KCl (aq) + Pb(NO3)2 (aq) → PbCl2 (s) + 2KNO3 (aq) You collect and dry the solid PbCl2 and find that it has a mass of 3.45 g. Determine the limiting reactant, and the percent yield? How many grams of excess reactant will remain when the reaction is complete?
K2CO3 1.5 H20 Br он heat 2,3-dibromocinnamic acid trans-1-bromo-2-phenylethene Compound MW mp (C)bp (C) density (g/ml)...
K2CO3 1.5 H20 Br он heat 2,3-dibromocinnamic acid trans-1-bromo-2-phenylethene Compound MW mp (C)bp (C) density (g/ml) mol) 2,3-dibromocinnamic acid 307.97 93-95 (threo) n'a n a 202-204 (erythro)E K CO.1.5H:O1 methylene chloride 138.21 84.93 56.11 891 na n a n'a 39.6 n a n a 1.33 n a 3 MKOH 2. a. What is the by-product formed in this reaction (not shown in given reaction equation)? b. What is the purpose of adding 3 M KOH at the beginning of the...
2. How many mL of 0.100M NaOH would you need to titrate if you measured out...
2. How many mL of 0.100M NaOH would you need to titrate if you measured out 0.120 g of oxalic acid? Must show calculation. (5 pts) lying an unknown acid Objective: Identify an unknown diprotic acid by determining its molecular weight. Introduction: A diprotic acid is an acid that yields two H ions per acid molecule. Therefore, two moles of NaOH are need to react with every one mole of diprotic acid. The net reaction of a diprotic acid, H:X,...
Write out your separation scheme for this experiment. 1. Heat 75 mL of water to 90...
Write out your separation scheme for this experiment. 1. Heat 75 mL of water to 90 °C in a 250-mL beaker. 2. While the water is being heated, place 250 mg of salicylic acid, 1 drop of 85% phosphoric acid and 0.5 mL of acetic anhydride in a test tube. Add a boiling chip to the mixture and gently shake it in order to mix the reactants. 3. Heat the tube in the beaker of water at 85 - 90...
1. A 19.6 gram sample of KCl is used to make a 275. mL KCl solution....
1. A 19.6 gram sample of KCl is used to make a 275. mL KCl solution. What is the molarity of the KCl solution? 2. A chemist has a bottle containing 0.25 M CuCl2. How many milliliters of this solution should the chemist use to add 12.0 grams of CuCl2 to her reaction? 3. In a saturated solution of the ionic compound sodium sulfate, Na3PO4 all of the water molecules are involved in the hydration process. some solid Na3PO4 is...
1. How many grams of pure, solid NaOH are required to make 400 mL of 0.1M NaOH solution? 2. How many grams of a sol...
1. How many grams of pure, solid NaOH are required to make 400 mL of 0.1M NaOH solution? 2. How many grams of a solution that is 50% by weight NaOH is required to make 400 mL of 0.1M NaOH solution? 3. The density of a 50% solution of NaOH is 1.525 g/mL. What volume of a solution that is 50% by weight NaOH is required to make 300 mL of 0.1M NaOH solution? 4. Why does weighing by difference...
the 3 pages deal with limiting reactant and percentage yield. the mixture starts out as a...
the 3 pages deal with limiting reactant and percentage yield.
the mixture starts out as a bright blue and when spinning in the
cup smokes ans starts to tirn a black color and the end result is a
brown color. then the funnel part was a light blue color.
1. Weigh approximately 7.0 g of CuCl2 and place them in the 100 ml beaker. Record the exact mass in the data table below. Note the appearance of the CuCl2 crystals...
b. How would you prepare 225.0 mL of 1.33 M HCl from a 6.00 M stock solution? C. When 25.00 mL of 0.695 M HCl reacts...
b. How would you prepare 225.0 mL of 1.33 M HCl from a 6.00 M stock solution? C. When 25.00 mL of 0.695 M HCl reacts with an excess of silver nitrate, will a precipitate form? Write the net ionic equation for this reaction. How many grams of precipitate can be theoretically obtained? d. What volume of 0.2500 M strontium hydroxide is required to completely react with 75.00 mL of 0.07942 M HCI? e. When 37.5 mL of 0.439 M...
A 12.34 mL solution with an unknown salt concentration had a mass of 10.25 g. When the water was evaporated from the solution. 4.78 g of NaCl remained. a Calculate the mass-mass percent NaCl concentration in the solution. Show your work. b Calculate the mass-volume percent NaCl concentration in the solution. Show your work. Calculate the molarity of NaCl in the solution. Show your work.
K2CO3 1.5 H20 Br он heat 2,3-dibromocinnamic acid trans-1-bromo-2-phenylethene Compound MW mp (C)bp (C) density (g/ml) mol) 2,3-dibromocinnamic acid 307.97 93-95 (threo) n'a n a 202-204 (erythro)E K CO.1.5H:O1 methylene chloride 138.21 84.93 56.11 891 na n a n'a 39.6 n a n a 1.33 n a 3 MKOH 2. a. What is the by-product formed in this reaction (not shown in given reaction equation)? b. What is the purpose of adding 3 M KOH at the beginning of the...
2. How many mL of 0.100M NaOH would you need to titrate if you measured out 0.120 g of oxalic acid? Must show calculation. (5 pts) lying an unknown acid Objective: Identify an unknown diprotic acid by determining its molecular weight. Introduction: A diprotic acid is an acid that yields two H ions per acid molecule. Therefore, two moles of NaOH are need to react with every one mole of diprotic acid. The net reaction of a diprotic acid, H:X,...
1. How many grams of pure, solid NaOH are required to make 400 mL of 0.1M NaOH solution? 2. How many grams of a solution that is 50% by weight NaOH is required to make 400 mL of 0.1M NaOH solution? 3. The density of a 50% solution of NaOH is 1.525 g/mL. What volume of a solution that is 50% by weight NaOH is required to make 300 mL of 0.1M NaOH solution? 4. Why does weighing by difference...
the 3 pages deal with limiting reactant and percentage yield.
the mixture starts out as a bright blue and when spinning in the
cup smokes ans starts to tirn a black color and the end result is a
brown color. then the funnel part was a light blue color.
1. Weigh approximately 7.0 g of CuCl2 and place them in the 100 ml beaker. Record the exact mass in the data table below. Note the appearance of the CuCl2 crystals...
b. How would you prepare 225.0 mL of 1.33 M HCl from a 6.00 M stock solution? C. When 25.00 mL of 0.695 M HCl reacts with an excess of silver nitrate, will a precipitate form? Write the net ionic equation for this reaction. How many grams of precipitate can be theoretically obtained? d. What volume of 0.2500 M strontium hydroxide is required to completely react with 75.00 mL of 0.07942 M HCI? e. When 37.5 mL of 0.439 M...
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