Homework Answers
If there was an error in the measurement of the mass of the alcohol, and this was greater than the real one, the calculated molar weight will be greater.
A lower to real mole result was obtained, this also produces a larger, erroneous molar weight result.
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3. Suppose a student performs this experiment and obtains a molecular weight of 70 g/mol for isopropyl alcohol. Giv...
750 mt 2. Calculate the molecular weight of Freon-12, if 122.70 liters of its vapor at...
750 mt 2. Calculate the molecular weight of Freon-12, if 122.70 liters of its vapor at 200.00 C and 790.00 mm Hg has a mass of 397.00 g. Show your work. 3. Suppose a student performs this experiment and obtains a molecular weight of 70 g/mol for isopropyl alcohol. Give valid sources of error for what could have caused the molecular weight to be higher than expected. 4. Suppose a student performs this experiment and obtains a molecular weight of...
1) A student performs an experiment to determine the density of a sugar solution. She obtains...
1) A student performs an experiment to determine the density of a sugar solution. She obtains the following results 136 g ml, 1.81 gmL 1.80 g/mL, 1.81 g/mL. If the actual value for the density of the sugar solution is 1.80 g/ml, which statement below best describes her results? A) Her results are precise, but not accurate. C) Her results are both precise and accurate B) Her results are neither precise nor accurate. D) Her results are accurate, but not...
3) a) The average molecular weight Mm (g/mol) for a thermoplastic material that has the mean weig...
3) a) The average molecular weight Mm (g/mol) for a thermoplastic material that has the mean weight fractions f for the weight ranges listed in the table is: f M Molecular weight range, g/mol 5,000-10,000 10,000- 15,000 15,000-20,000 20,000-25,000 0.30 0.20 0.35 0.15 Σ fi 1.00 What is the mass of one polymer chain in grams? b)
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Experiment Lab Questions: Distillation of Alcohol Reagents: (1) Ethanol (C2H5OH) [ MW = 46.07 g/m...
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subject: calorimetry Post Laboratory Questions 1. A student places 138 g of an unknown metal at...
subject: calorimetry
Post Laboratory Questions 1. A student places 138 g of an unknown metal at 99.9°C into 60.00 g of water at 22.2 °C. The entire system reaches a uniform temperature of 31.5 °C. Calculate the specific heat capacity of the metal. 2. If the correct specific heat of the metal in problem 1 is 0.25 J/gºC, calculate the percent crror. 3. While transferring the piece of unknown metal to the calorimeter, the student dropped the metal into the...
i dont understand why the molecular weight i calculated (42.012 g/mol) for my unknown liquid (acetone)...
i dont understand why the molecular weight i calculated
(42.012 g/mol) for my unknown liquid (acetone) is less than the
actual molecular weight (58.08 g/mol). what errors could i have
made in my lab that would account for the difference.
Molecular Weight of a Volatile Liquid In this experiment, an amount of liquid more than sufficient to fill the flask when vaporized is placed in a flask of measured volume and mass. The flask is then heated in a boiling...
3 8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a...
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Name Experiment 7 - PREPARATION OF ASPIRIN AND OTHER ESTERS Date Partner Station # - Pre-Lab...
Name Experiment 7 - PREPARATION OF ASPIRIN AND OTHER ESTERS Date Partner Station # - Pre-Lab Preparation Section Questions 1-3 refer to these structures: CH,CH-O-CH,CH, CH,CH,CH,CH.CH.CH-OH CH,-0-0-CH,CH.CH, O anch-o- & -on,ch, and on and ansch.com 1. a) List the letters for the structures that are esters. b) Circle the ester functional group in any esters. 2. a) Write the letters for the two compounds that could be used to make an ester by an esterification reaction. b) Write the reaction...
for question 1 the molar mass of unknown is 102g/mol hation by Freezing Point Depression Vernier...
for
question 1 the molar mass of unknown is 102g/mol
hation by Freezing Point Depression Vernier Logger Pro for Windows Section Post-Laboratory Questions (Use the space provided and additional paper if necessary. Record your nemerical answers in the boxes provided.) 1. Obtain the correct molar mass of your unknown from your laboratory instructor. Calculate the percent error in the molar mass that you found. Torg/mol percent error, 2. A student determined the freezing point of pure t-butyl alcohol following the...
750 mt 2. Calculate the molecular weight of Freon-12, if 122.70 liters of its vapor at 200.00 C and 790.00 mm Hg has a mass of 397.00 g. Show your work. 3. Suppose a student performs this experiment and obtains a molecular weight of 70 g/mol for isopropyl alcohol. Give valid sources of error for what could have caused the molecular weight to be higher than expected. 4. Suppose a student performs this experiment and obtains a molecular weight of...
1) A student performs an experiment to determine the density of a sugar solution. She obtains the following results 136 g ml, 1.81 gmL 1.80 g/mL, 1.81 g/mL. If the actual value for the density of the sugar solution is 1.80 g/ml, which statement below best describes her results? A) Her results are precise, but not accurate. C) Her results are both precise and accurate B) Her results are neither precise nor accurate. D) Her results are accurate, but not...
3) a) The average molecular weight Mm (g/mol) for a thermoplastic material that has the mean weight fractions f for the weight ranges listed in the table is: f M Molecular weight range, g/mol 5,000-10,000 10,000- 15,000 15,000-20,000 20,000-25,000 0.30 0.20 0.35 0.15 Σ fi 1.00 What is the mass of one polymer chain in grams? b)
3) a) The average molecular weight Mm (g/mol) for a thermoplastic material that has the mean weight fractions f for the weight ranges...
1. 1. A student performed the recrystallization process that you already know. At the end of the experiment and drying the sample for 1 week, the student goes to the laboratory to be able to use some equipment and identify the compounds obtained. What is the importance of preparing the sample correctly, using the proper precautions and specificity of the equipment to be used? Do you think that this step can alter my results if I have not prepared the...
subject: calorimetry
Post Laboratory Questions 1. A student places 138 g of an unknown metal at 99.9°C into 60.00 g of water at 22.2 °C. The entire system reaches a uniform temperature of 31.5 °C. Calculate the specific heat capacity of the metal. 2. If the correct specific heat of the metal in problem 1 is 0.25 J/gºC, calculate the percent crror. 3. While transferring the piece of unknown metal to the calorimeter, the student dropped the metal into the...
i dont understand why the molecular weight i calculated
(42.012 g/mol) for my unknown liquid (acetone) is less than the
actual molecular weight (58.08 g/mol). what errors could i have
made in my lab that would account for the difference.
Molecular Weight of a Volatile Liquid In this experiment, an amount of liquid more than sufficient to fill the flask when vaporized is placed in a flask of measured volume and mass. The flask is then heated in a boiling...
3 8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average degree of polymerization of 5500. Calculate the fraction of styrene (CsHg) and butadiene (C4H6) mers in this copolymer. Atomic weights: C-12, H-1 b) What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in...
Name Experiment 7 - PREPARATION OF ASPIRIN AND OTHER ESTERS Date Partner Station # - Pre-Lab Preparation Section Questions 1-3 refer to these structures: CH,CH-O-CH,CH, CH,CH,CH,CH.CH.CH-OH CH,-0-0-CH,CH.CH, O anch-o- & -on,ch, and on and ansch.com 1. a) List the letters for the structures that are esters. b) Circle the ester functional group in any esters. 2. a) Write the letters for the two compounds that could be used to make an ester by an esterification reaction. b) Write the reaction...
for
question 1 the molar mass of unknown is 102g/mol
hation by Freezing Point Depression Vernier Logger Pro for Windows Section Post-Laboratory Questions (Use the space provided and additional paper if necessary. Record your nemerical answers in the boxes provided.) 1. Obtain the correct molar mass of your unknown from your laboratory instructor. Calculate the percent error in the molar mass that you found. Torg/mol percent error, 2. A student determined the freezing point of pure t-butyl alcohol following the...
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