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During an experiment, 5 junior high school students have measured the volume of a liquid at different moments. Their measurements were listed below. What is the mean of the measurements? Express your answer using the proper number of significant figures.

 

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20 Dec 2020

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Related questions

An empty flask and stopper is weighed in with a mass of 75.121 grams. To this flask 2 mL of an unknown liquid is added and then heated in a boiling water bath at 96°C. When all of the unknown liquid is vaporized the flask is removed from the bath and cooled. During the cooling the stopper is periodically opened just enough to let air in to equilibrate the internal and external pressures. During the experiment the laboratory barometer reads the pressure in the lab as 648 mm Hg. The flask is then weighed and found to have a mass of 76.036 grams. The volume of the flask is then measured and found to be 271.2 mL.

A) What is the pressure of the vapor in the flask in atm? (Report your answer to 3 significant figures.)

B) What was the temperature of the vapor in K? (Report your answer to 3 significant figures.)

C)What was the volume of the flask in liters? (Report your answer to 4 significant figures.

D) How many moles of vapor are present? Report the answer in scientific notation, using the following format #.## x 10^# moles. (Report your answer to 3 significant figures.) An example would be 1.23 x 10^-2 moles.

E) What was the mass of vapor that was present in the flask? (Report your answer to 3 significant figures.)

F)What is the molar mass of the unknown liquid? (Report your answer to 3 significant figures.)

please help me with whatever you can. thank you lots in advance

n this exercise, weighed samples of a solid unknown containing NaCl and NaHCO3 react with hydrochloric acid. The volume of the CO2 liberated by the reaction in the gas phase is measured with a gas collection syringe. From the volume we can calculate the number of moles of CO2 in the gas phase using the ideal gas approximation.

Since the CO2 is generated in an aqueous environment (aqueous HCl), some CO2 will dissolve in the liquid phase. The amount of CO2 dissolved in the liquid phase is computed using Henry's Law which requires knowing the partial pressure of CO2. As described in the exercise, this requires knowing the volume of the entire gas system ( VfTOT)

To insure that your answers agree with Mr. OSCER's, use the values in the below table for the basic constants required. .

Value

Units

Ideal Gas Constant

0.0821

L-atm/mol K

Convert Celsius temperture to Kelvin

273.15

K

Atmospheric Pressure

760.0

Torr

Molar Mass of NaHCO3

84.01

g/mol

Henry's Law Constant for CO2 in water

3.2 X 10-2

mmol/mL-atm

The figure below illustrates the volumes that are designated by Vtube and Vsyr .

Note also that Vsyr = Vf – Vi .

The table below contains data collected for one run of the required reaction, where an unknown sample mixture containing some NaHCO3 is mixed with hydrochloric acid:

Value Units

Initial Weight of container (empty)

 18.4395 g
Final Weight of container and unknown 18.6185 g
Volume of hydrochloric acid 10.0 mL
Volume of tube, Vtube (see Figure above) 92.3 mL
Initial volume of syringe (Vi) 5.0 mL
Final volume of syringe (Vf) 50.7 mL
Temperature 26.5 oC
Atmospheric Pressure 764.4 Torr
Vapor Pressure of Water at 26.5 oC 25.8

Torr

Use this data to answer the following questions. The appropriate units are specified in the each question. Pay close attention to the number of significant figures in your answers.

weight of sample (g) mixture before the start of the reaction = .179 g. Volume of CO2 gas (mL) that is produced by the reaction and is now contained in the syringe= 45.7 mL

1.

What is the mass percent of NaHCO3 in the mixture sample ?

Enter a numeric answer only, to the correct number of significant figures. Do not include units with your answer.

n this exercise, weighed samples of a solid unknown containing NaCl and NaHCO3 react with hydrochloric acid. The volume of the CO2 liberated by the reaction in the gas phase is measured with a gas collection syringe. From the volume we can calculate the number of moles of CO2 in the gas phase using the ideal gas approximation.

Since the CO2 is generated in an aqueous environment (aqueous HCl), some CO2 will dissolve in the liquid phase. The amount of CO2 dissolved in the liquid phase is computed using Henry's Law which requires knowing the partial pressure of CO2. As described in the exercise, this requires knowing the volume of the entire gas system ( VfTOT)

To insure that your answers agree with Mr. OSCER's, use the values in the below table for the basic constants required. .

Value

Units

Ideal Gas Constant

0.0821

L-atm/mol K

Convert Celsius temperture to Kelvin

273.15

K

Atmospheric Pressure

760.0

Torr

Molar Mass of NaHCO3

84.01

g/mol

Henry's Law Constant for CO2 in water

3.2 X 10-2

mmol/mL-atm

The figure below illustrates the volumes that are designated by Vtube and Vsyr .

Note also that Vsyr = Vf – Vi .

The table below contains data collected for one run of the required reaction, where an unknown sample mixture containing some NaHCO3 is mixed with hydrochloric acid:

Value Units

Initial Weight of container (empty)

 18.4395 g
Final Weight of container and unknown 18.6185 g
Volume of hydrochloric acid 10.0 mL
Volume of tube, Vtube (see Figure above) 92.3 mL
Initial volume of syringe (Vi) 5.0 mL
Final volume of syringe (Vf) 50.7 mL
Temperature 26.5 oC
Atmospheric Pressure 764.4 Torr
Vapor Pressure of Water at 26.5 oC 25.8

Torr

Use this data to answer the following questions. The appropriate units are specified in the each question. Pay close attention to the number of significant figures in your answers.

weight of sample (g) mixture before the start of the reaction = .179 g. Volume of CO2 gas (mL) that is produced by the reaction and is now contained in the syringe= 45.7 mL

1.

What mass (g) of NaHCO3 was contained in the sample mixture that was mixed with HCl ?

Enter a numeric answer only, to the correct number of significant figures. Do not include units with your answer.

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