A student determines the molar mass of acetone, CH3COCH3, by the method used in this experiment....
A student determines the molar mass of acetone, CH3COCH3, by the method used in this experiment. He found that the equilibrium temperature of a mixture of ice and water was 1.2oC on his thermometer. When he added 12.2 g of her sample to the mixture, the temperature, after thorough stirring, fell to –3.0oC. He then poured off the solution through a screen into a beaker. The mass of the solution was 100.5 g. How much acetone would there be in a solution containing 1 kg of water and acetone at the concentration as he had in his experiment?
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A student determines the molar mass of acetone, CH3COCH3, by the
method used in this experiment....
Chame nsead tu age 06-17 Experiment 8: Molar Mass of a Volatile Liquid Purpose To determine...
Chame nsead tu age 06-17 Experiment 8: Molar Mass of a Volatile Liquid Purpose To determine the molar mass of a pure substance we need to find out (a) the number of moles in a given sample, and (b) the mass of the same sample. Molar mass is then: mass divided by moles Introduction Using the ideal gas equation, PV= nRT, we can determine the number of moles (n) of gas or vapor under measured conditions of pressure (P), volume...
A student devised an experiment to determine the molar mass of an unknown gas X. Firstly,...
A student devised an experiment to determine the molar mass of an unknown gas X. Firstly, he filled a glass gas syringe (accurate to ± 0.5 cm3 ) with 100 cm3 of air then placed a rubber seal over the nozzle and weighed the syringe. He then emptied the gas syringe, refilled it with 100 cm3 of the unknown gas X, replaced the rubber seal and reweighed the syringe. Finally, he measured the temperature of the room. He obtained the...
A student designed his experiment based on Dumas method to determine the molecular 5 Pts mass...
A student designed his experiment based on Dumas method to determine the molecular 5 Pts mass of an unknown volatile liquid and tabulated the data obtained from his cxpcriment. From the given data calculate the Molar mass of the unknown liquid and percent error if the accepted molar mass is Y g/mol. Q8. Mass of flask, boiling stone, foil cap, & unknown liquid after cooling Mass of flask, boiling stone and foil cape Water bath temperature Barometric pressure Volume of...
1.A Chem 1211L student performed this experiment. He used 3.100 g of mixture and determined it...
1.A Chem 1211L student performed this experiment. He used 3.100 g of mixture and determined it contained 1.200 g of NH4Cl , 0.685 g of sand and 1.410 g of NaCl. What is wrong with the student’s results? What is the most likely cause of the error? 2..755 mL of a solution contains 175 mL acetone, 325 mL alcohol and the remainder is water. Calculate the % concentrations of the acetone, alcohol and water. Show all work to receive credit.
A student obtained a vial of powder consisting of a mixture of iron (III) chloride hexahydrate...
A student obtained a vial of powder consisting of a mixture of iron (III) chloride hexahydrate (FeCl_3-6H_2O) and silver nitrate (AgNO_3) in unknown proportions. He weighed the vial with the powder in it and found the mass to be 20.560 g. He then poured the powder into a beaker and found the mass of the empty vial to be 15.723 g. Water was added (500 mL) to powder in the beaker, and the contents were mixed and heated for 15...
Before you can start this experiment, you must: Solve problems I, II, and III Pass an...
Before you can start this experiment, you must: Solve problems I, II, and III Pass an 8 question on-screen computer quiz In problems I, II, and III: Calorimeter constant is 0.00 j/°C Specific Heat of water or aqueous solutions is 4.18 j/g °C I. 89.6542 g of metal were heated to 101.1 °C and poured into a calorimeter containing 49.60 g of water at 27.35 °C. After stirring, the temperature of the water rose rapidly to 34.75 °C before slowly...
The experiment this is in reference to is the determination of molar mass of a metal....
The experiment this is in
reference to is the determination of molar mass of a metal. a piece
of magnesium ribbon was dangled on a copper wire into a tube with
tap water and hydrochloric acid then placed into a beaker of water
that was at room temperature.
Questions 1. Practice: Oxygen can be generated by thermal decomposition of potassium chlorate: 2 KClO3 (s) —> 2 KCl (s) + 3 O2 (g) Calculate the volume of oxygen (in liters) produced...
In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine...
In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Thermometer Stirring red A student heats 68.26 grams of titanium to 99.16 °C and then drops it into a cup containing 80.78 grams of water at 23.25 °C. She measures the final temperature to be 30.68 °C. The heat capacity of the calorimeter (sometimes referred to as the...
A student needs to prepare 100.0 mL of vitamin C solution according to the directions in...
A student needs to prepare 100.0 mL of vitamin C solution according to the directions in Part 1 of the experiment. S/he weighs out 0.0471 g vitamin C (molar mass = 176.124 g/mol) and dissolves it in water to give 100.0 ml solution. S/he pipets 10.00 mL of the solution into a beaker and adds 20 mL of water and 10 mL of buffer. (a) How many mg of vitamin C are in the beaker? 4.9 4.71 mg (b) Suppose...
how do I get the molar ratios between NaBr, 1-butanol and H2SO4 used in the experiment...
how do I get the molar ratios between NaBr, 1-butanol
and H2SO4 used in the experiment sn2 reaction 1-bromobutane
Moles:
NaBr: 0.0275
Butanol: 0.0216
H2SO4: 0.00840
butanol is the limiting reagent
Experiment: 08 The S2 Reaction: 1-Bromobutane Substitution nucleophilic bimolecular (SN2) reactions can be utilized to convert primary alcohols to corresponding halogens. In this experiment, 1-butanol is treated with a nucleophile (Br) to generate the corresponding 1-bromobutane. The nucleophile in this lab is generated from an aqueous solution of NaBr....
Chame nsead tu age 06-17 Experiment 8: Molar Mass of a Volatile Liquid Purpose To determine the molar mass of a pure substance we need to find out (a) the number of moles in a given sample, and (b) the mass of the same sample. Molar mass is then: mass divided by moles Introduction Using the ideal gas equation, PV= nRT, we can determine the number of moles (n) of gas or vapor under measured conditions of pressure (P), volume...
A student designed his experiment based on Dumas method to determine the molecular 5 Pts mass of an unknown volatile liquid and tabulated the data obtained from his cxpcriment. From the given data calculate the Molar mass of the unknown liquid and percent error if the accepted molar mass is Y g/mol. Q8. Mass of flask, boiling stone, foil cap, & unknown liquid after cooling Mass of flask, boiling stone and foil cape Water bath temperature Barometric pressure Volume of...
A student obtained a vial of powder consisting of a mixture of iron (III) chloride hexahydrate (FeCl_3-6H_2O) and silver nitrate (AgNO_3) in unknown proportions. He weighed the vial with the powder in it and found the mass to be 20.560 g. He then poured the powder into a beaker and found the mass of the empty vial to be 15.723 g. Water was added (500 mL) to powder in the beaker, and the contents were mixed and heated for 15...
The experiment this is in
reference to is the determination of molar mass of a metal. a piece
of magnesium ribbon was dangled on a copper wire into a tube with
tap water and hydrochloric acid then placed into a beaker of water
that was at room temperature.
Questions 1. Practice: Oxygen can be generated by thermal decomposition of potassium chlorate: 2 KClO3 (s) —> 2 KCl (s) + 3 O2 (g) Calculate the volume of oxygen (in liters) produced...
In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Thermometer Stirring red A student heats 68.26 grams of titanium to 99.16 °C and then drops it into a cup containing 80.78 grams of water at 23.25 °C. She measures the final temperature to be 30.68 °C. The heat capacity of the calorimeter (sometimes referred to as the...
A student needs to prepare 100.0 mL of vitamin C solution according to the directions in Part 1 of the experiment. S/he weighs out 0.0471 g vitamin C (molar mass = 176.124 g/mol) and dissolves it in water to give 100.0 ml solution. S/he pipets 10.00 mL of the solution into a beaker and adds 20 mL of water and 10 mL of buffer. (a) How many mg of vitamin C are in the beaker? 4.9 4.71 mg (b) Suppose...
how do I get the molar ratios between NaBr, 1-butanol
and H2SO4 used in the experiment sn2 reaction 1-bromobutane
Moles:
NaBr: 0.0275
Butanol: 0.0216
H2SO4: 0.00840
butanol is the limiting reagent
Experiment: 08 The S2 Reaction: 1-Bromobutane Substitution nucleophilic bimolecular (SN2) reactions can be utilized to convert primary alcohols to corresponding halogens. In this experiment, 1-butanol is treated with a nucleophile (Br) to generate the corresponding 1-bromobutane. The nucleophile in this lab is generated from an aqueous solution of NaBr....
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