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13 Dec 2019

Mass of 18.0 mL of water: 18.0 g

Mass of 12 marbles: 43.4 g

Volume of 12 marbles: 21.5 mL

Water density: 1.00 g/mL

Marble density: 2.02 g/mL

Questions:

1. What is the number of moles of water present in 18.0 g of water? (use correct sig fig)

2. Use scientific notation for the number of water molecules in 18.0 g of water.

3. How many water molecules would have the mass of one marble?

4. Neglect empty space between molcules and calculate average volume of a water molecule in mL.

5. What is the average volume of a marble?

6. How many water molecules could fit in the same volume as one marble?

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17 Dec 2019

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In lab you determined the volume of 12 marbles and the mass of 18.0 mL of water. Use the following data, which should closely approximate your results, to answer the questions below.

Mass of 18.0 mL of water 18.01 g

Mass of 12 marbles

(from Data Table B) WebAssign will check your answer for the correct number of significant figures. g

Volume of 12 marbles 19.6 mL

(a) What are the densities determined from the data above?

water WebAssign will check your answer for the correct number of significant figures. g/mL

marbles WebAssign will check your answer for the correct number of significant figures. g/mL

(b) The number of moles of water present in 18.01 g of water is WebAssign will check your answer for the correct number of significant figures. mol.

(c) Use scientific notation for the number of water molecules in 18.01 g of water. (Enter your answer using the format 2.2e21 for 2.2 1021.)

WebAssign will check your answer for the correct number of significant figures. molecules

(d) What is the mass of a single molecule of water?

WebAssign will check your answer for the correct number of significant figures. g

(e) How many water molecules would have the mass of one marble?

WebAssign will check your answer for the correct number of significant figures. molecules

(f) Neglect empty space between molecules and calculate the average volume of a water molecule.

WebAssign will check your answer for the correct number of significant figures. mL

(g) What is the average volume of a marble?

WebAssign will check your answer for the correct number of significant figures. mL

(h) How many water molecules could fit in the same volume as one marble?

ultramarinewallaby658

The herbicide dichlobenil (2,6-dichlorobenzonitrile, C7H3Cl2N) has a solubility of 18.0 mg/L by mass in water at 20 âC. The herbicide disintegrates with a half-life (first order) of 1.00 year. Suppose that 257 kg of dichlobenil is applied in the fields surrounding a 7.50-acre pond having an average depth of 3.00 ft. Suppose further that half of the dichlobenil permeates into the pond and that this happens within a few days. Assume that the density of the pond water is 1.00 g/mL.

The following conversion factors will be helpful:

1 acre=43,560 ft

1 ft=212 in

1 in=2.54 cm

1 cm=1 mL

31 ft^3=28,317 cm3

Part A

After a few days, what will be the concentration of dichlobenil in the pond?

Express the concentration numerically in parts per million by mass.

Part B

Once the pond becomes saturated in dichlobenil, how many molecules of the herbicide will be dissolved per liter of pond water?

Express the number of molecules numerically.

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