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3.What is the true mass of water if the measured mass in the atmosphere is 5.397 4 g? When you look up the density of water, assume thatthe lab temperature is (a)15OC and (b)25OC. Take the density of air tobe 0.001 2 g/mL and the density of balance weights to be 8.0 g/mL.(2)

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Related questions

2. Make buoyancy corrections for the weights in part 1 to determine the real mass of each sample of water. Use the buoyancy correction equation, assuming the balance weights have a density of 8.0 g/mL. Use the density of water determined from the appendix (the temperature is 22°C). The Density of Water at 22 degrees Celsius is 0.9977735 (g/mL).

1. Using a 25-mL volumetric transfer pipet, pipet 25 mL of DI water into a dry, pre-weighed, conical flask or a beaker and weigh the sample. Use an analytical balance (± 0.0001 g) to make these weighings. Read and carefully follow the "Analytical Balance" instructions. Repeat 3 times. Calculate the average value of your measurements and the standard deviation.

Wvac = Wair + Wair [(0.0012/Do)-(0.0012/Dw)]

Wvac = weight in vacuum, g; Wair = weight in air, g

Do = density of object; Dw = density of weights

0.0012 = density of air

This table shows the results of the 25 mL transfer:

25-mL Trial #

Mass of flask

(without water)

Mass of flask

(with water)

Mass of the water

(Difference in masses)

1

48.0485 g

72.6685 g

24.6200 g

2

51.5100 g

76.2950 g

24.7850 g

3

55.2756 g

80.1296 g

24.8540 g

Average value: 24.5730 g

Standard Deviation: 0.0981733 g

This table shows the results of the 10 mL transfer:

10-mL Trial #

Mass of flask

(without water)

Mass of flask

(with water)

Mass of the water

(Difference in masses)

1

48.0167 g

57.9463 g

9.9295 g

2

52.0842 g

62.0142 g

9.9300 g

3

55.2745 g

65.2300 g

9.9555 g

Average Value: 9.9383 g

Standard Deviation: 0.12140 g (five significant figures within the mass of water).

Can somebody help me fill out part c1 and 2 please

A chemical (toxaphene) is being prepared for an experiment. Relevant chemical properties (25oC) are: vapor pressure, 53 Pa; solubility, 800 μg/L; density, 1.65 g/cm3 ; Koc 5000 L/kg; and molecular weight 414 g/mol. Note the room temperature is 25oC and there are 101 kPa/atm.

1.What volume of pure chemical (μL) needs to be added to a 250 mL flask containing 100 mL of water to saturate both the water and air phases in the flask?

2. If the fugacity of the system were 10 Pa what would be the water concentration (μg/L)?

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