Homework Answers
Since PV = nRT.
R = PV / nT
During cooling of test-tube some water flows back into flask.
Correct answers :
- a. all measurements should be made at same 'T'.
- b. The Volume measured from beaker will be high.]
- c. measured 'T' is room 'T'.
- e. The calculated Value of 'R' is high.
- g. if system is not cooled, gas is expanded , and its volume is high.
Add Answer to:
Indicate whether the following experimental mistake will increase, decrease, or have no effect on the calculated...
Indicate whether the following experimental mistakes will increase or decrease the calculated value of R; explain...
Indicate whether the following experimental mistakes will increase or decrease the calculated value of R; explain your answers. a.) In adjusting the final water level after the O2 was produced, the student adjusted the levels to the bottom of the water in the beaker and the top of the water in the flask (rather than correctly the top of each). b.) A student completed the experiment without waiting for the test tube to cool after heating.
With the data given, help on the calculations please - Tes Name Determination of the Gas...
With the data given, help on the calculations please
- Tes Name Determination of the Gas Constant, R, and the Purity of KCIO, Data Unknown number or letter Mass of test tube and iron (IIT) oxide 44.5928 Mass of test tube, iron (III) oxide and sample 44.979 8 Mass of test tube and contents after heating 44.8488 Volume of water displaced Barometric pressure 976 mbar Temperature of water temperature of O, 23 Vapor pressure of water at this temperature 21.068_mm...
please show steps. thanks ! Experiment 19 Gas Stoichiometry and the Gas Laws The relationship between...
please show steps. thanks !
Experiment 19 Gas Stoichiometry and the Gas Laws The relationship between the physical properties of a gas, and the moles, is given by the “Ideal Gas Law:" PV=nRT where n-number of moles R=the ideal gas constant: 0.0821 atm L mole 'Kor 62.4 L torr molek In this experiment, the theoretical yield of gas, will be compared to the experimental yield. The reaction of aluminum with hydrochloric acid produces hydrogen according to the balanced equation below....
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...
part c and d please ? The Gas Laws h. Measured final volume of gas in...
part c and d please ?
The Gas Laws h. Measured final volume of gas in the flask (V2 measured): mL 26laml 1. Calculated final volume of gas in the flask (V2 calculated): mL 3247610 371.65 295.75 j. Percent of error: % 3% Calculations (include all units): 0.872 = 0.899 2. Review Questions: a. Suppose a student performed this experiment but did NOT close off the rubber tubing during the transfer to the cold water bath. Would their V2 measured...
Questions 1-4 Before reaction: a. unknown number b. weight of beaker, test tube weight of beaker,...
Questions 1-4
Before reaction: a. unknown number b. weight of beaker, test tube weight of beaker, test tube, KCIO3 KCI d. weight of beaker, test tube, KCIO3 KCI. Mno2 e. weight of KCIO3 KCl sample (c-b) After reaction: f. volume of oxygen collected at laboratory temperature and pressure -22.3% 246.3 n (determined by the amount of water expelled from the flask g. temperature of the oxygen h. water vapor pressure at the measured temperature (table: Handbook of Chemistry and Physics)...
the question is number 3 in the first picture and the rest are the lab informations...
the
question is number 3 in the first picture and the rest are the lab
informations and procedures.
Page < 2 > 0f50 - 200M + 3. Explain fully the purpose of vapor pressure of water in calculations of partial pressure of Hydrogen gas in this experiment. Page < 1 > of 3 d EQUIVALENT MASS OF AN UNKNOWN METAL INTRODUCTION Active metals react with strong acids to produce hydrogen gas. These are oxidation-reduction Li+ HCl – Lic1+52 reactions. Li+...
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...
Please help with questions 1-7!!!! Experiment 12 The General Gas Law 8.79 for larm 29. GainHg...
Please help with questions 1-7!!!!
Experiment 12 The General Gas Law
8.79 for larm 29. GainHg : 760 torr latm IV. DATA Name Enima taub Trial 2 Trial 1 Volume of flask with stopper 1353. ImL 329 UL Volume of water in flask 70.0 ml Volume of the cool gas 283. I ml 260ML Temperature of boiling water 100.0'C→ 373.6K 49.66 | 372.6 Temperature of the cool water 19.3°C 282.9k 18.5" 281.54 Barometric pressure 29.01 in Hg 29.06InHg Vapor pressure...
You are given an unknown containing KClO3. Following the procedure in your manual, you obtain the...
You are given an unknown containing KClO3. Following the procedure in your manual, you obtain the following fictional data Note! For this problem use the given (allbeit incorrect) vapor pressure of water Mass of empty test tube 71.8394 g Mass of test tube + unknown 72.1363 g Mass of test tube + unknown + MnO2 72.3077 g Mass of erlenmeyer flask with residual water 323.06 g Mass of erlenmeyer flask filled with water 358.52 g Atmospheric pressure 760.9 mmHg Temperature...
With the data given, help on the calculations please
- Tes Name Determination of the Gas Constant, R, and the Purity of KCIO, Data Unknown number or letter Mass of test tube and iron (IIT) oxide 44.5928 Mass of test tube, iron (III) oxide and sample 44.979 8 Mass of test tube and contents after heating 44.8488 Volume of water displaced Barometric pressure 976 mbar Temperature of water temperature of O, 23 Vapor pressure of water at this temperature 21.068_mm...
please show steps. thanks !
Experiment 19 Gas Stoichiometry and the Gas Laws The relationship between the physical properties of a gas, and the moles, is given by the “Ideal Gas Law:" PV=nRT where n-number of moles R=the ideal gas constant: 0.0821 atm L mole 'Kor 62.4 L torr molek In this experiment, the theoretical yield of gas, will be compared to the experimental yield. The reaction of aluminum with hydrochloric acid produces hydrogen according to the balanced equation below....
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...
part c and d please ?
The Gas Laws h. Measured final volume of gas in the flask (V2 measured): mL 26laml 1. Calculated final volume of gas in the flask (V2 calculated): mL 3247610 371.65 295.75 j. Percent of error: % 3% Calculations (include all units): 0.872 = 0.899 2. Review Questions: a. Suppose a student performed this experiment but did NOT close off the rubber tubing during the transfer to the cold water bath. Would their V2 measured...
Questions 1-4
Before reaction: a. unknown number b. weight of beaker, test tube weight of beaker, test tube, KCIO3 KCI d. weight of beaker, test tube, KCIO3 KCI. Mno2 e. weight of KCIO3 KCl sample (c-b) After reaction: f. volume of oxygen collected at laboratory temperature and pressure -22.3% 246.3 n (determined by the amount of water expelled from the flask g. temperature of the oxygen h. water vapor pressure at the measured temperature (table: Handbook of Chemistry and Physics)...
the
question is number 3 in the first picture and the rest are the lab
informations and procedures.
Page < 2 > 0f50 - 200M + 3. Explain fully the purpose of vapor pressure of water in calculations of partial pressure of Hydrogen gas in this experiment. Page < 1 > of 3 d EQUIVALENT MASS OF AN UNKNOWN METAL INTRODUCTION Active metals react with strong acids to produce hydrogen gas. These are oxidation-reduction Li+ HCl – Lic1+52 reactions. Li+...
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...
Please help with questions 1-7!!!!
Experiment 12 The General Gas Law
8.79 for larm 29. GainHg : 760 torr latm IV. DATA Name Enima taub Trial 2 Trial 1 Volume of flask with stopper 1353. ImL 329 UL Volume of water in flask 70.0 ml Volume of the cool gas 283. I ml 260ML Temperature of boiling water 100.0'C→ 373.6K 49.66 | 372.6 Temperature of the cool water 19.3°C 282.9k 18.5" 281.54 Barometric pressure 29.01 in Hg 29.06InHg Vapor pressure...
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