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Suppose a group of volunteers is planning to build a park near a local lake. The lake is known to contain low levels of arsenic (As). Therefore, prior to starting construction, the group decides to measure the current level of arsenic in the lake. If a 11.7 cm³ sample of lake water is found to have 172.3 ng As, what is the concentration of arsenic in the sample in parts per billion (ppb), assuming that the density of the lake water is 1.00 g/cm³? concentration: ppb One of the volunteers suggests hiring an on-site water treatment company to remove the arsenic from the lake. The company claims their process takes 2.98 days to remove 31.30 kg of arsenic from a water source. Calculate the total mass, in kilograms, of arsenic in the lake that the company will have to remove if the total volume of water in the lake is 0.950 km². total mass:

Suppose a group of volunteers is planning to build a park near a local lake. The lake is known to contain low levels of arsenic (As). Therefore, prior to starting construction, the group decides to measure the current level of arsenic in the lake. If a 11.7 cm³ sample of lake water is found to have 172.3 ng As, what is the concentration of arsenic in the sample in parts per billion (ppb), assuming that the density of the lake water is 1.00 g/cm³? concentration: ppb One of the volunteers suggests hiring an on-site water treatment company to remove the arsenic from the lake. The company claims their process takes 2.98 days to remove 31.30 kg of arsenic from a water source. Calculate the total mass, in kilograms, of arsenic in the lake that the company will have to remove if the total volume of water in the lake is 0.950 km². total mass:

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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### Arsenic Concentration Measurement in Lake Water: A Case Study **Context:** A group of volunteers is planning to build a park near a local lake. The lake is known to contain low levels of arsenic (As). Therefore, prior to starting construction, the group decides to measure the current level of arsenic in the lake. #### Problem Statement If an 11.7 cm³ sample of lake water is found to have 172.3 ng of arsenic (As), what is the concentration of arsenic in the sample in parts per billion (ppb), assuming that the density of the lake water is 1.00 g/cm³? **Calculation:** Concentration: ________________ ppb #### Additional Consideration One of the volunteers suggests hiring an on-site water treatment company to remove the arsenic from the lake. The company claims their process takes 2.98 days to remove 31.30 kg of arsenic from a water source. **Task:** Calculate the total mass, in kilograms, of arsenic in the lake that the company will have to remove if the total volume of water in the lake is 0.950 km³. **Calculation:** Total mass: ________________ kg --- **Explanation:** 1. **Determining the concentration of arsenic in the sample:** - The sample volume of water is 11.7 cm³. - 172.3 ng (nanograms) of arsenic is present in the sample. - The density of the lake water is provided as 1.00 g/cm³, which means 1 cm³ of water is equivalent to 1 gram of water. First, convert the mass of water from grams to kilograms: - Volume of sample water = 11.7 cm³ - Given, density = 1.00 g/cm³ - Thus, mass of sample water = \( 11.7 \, \text{cm}^3 \times 1.00 \, \text{g/cm}^3 = 11.7 \, \text{g} \) Since 1 gram of water is 1 cm³, the sample is 11.7 grams (0.0117 kilograms). Now, calculate the concentration in nanograms per kilogram to convert it into ppb (parts per billion): - \( \text{Concentration} =
Transcribed Image Text:### Arsenic Concentration Measurement in Lake Water: A Case Study **Context:** A group of volunteers is planning to build a park near a local lake. The lake is known to contain low levels of arsenic (As). Therefore, prior to starting construction, the group decides to measure the current level of arsenic in the lake. #### Problem Statement If an 11.7 cm³ sample of lake water is found to have 172.3 ng of arsenic (As), what is the concentration of arsenic in the sample in parts per billion (ppb), assuming that the density of the lake water is 1.00 g/cm³? **Calculation:** Concentration: ________________ ppb #### Additional Consideration One of the volunteers suggests hiring an on-site water treatment company to remove the arsenic from the lake. The company claims their process takes 2.98 days to remove 31.30 kg of arsenic from a water source. **Task:** Calculate the total mass, in kilograms, of arsenic in the lake that the company will have to remove if the total volume of water in the lake is 0.950 km³. **Calculation:** Total mass: ________________ kg --- **Explanation:** 1. **Determining the concentration of arsenic in the sample:** - The sample volume of water is 11.7 cm³. - 172.3 ng (nanograms) of arsenic is present in the sample. - The density of the lake water is provided as 1.00 g/cm³, which means 1 cm³ of water is equivalent to 1 gram of water. First, convert the mass of water from grams to kilograms: - Volume of sample water = 11.7 cm³ - Given, density = 1.00 g/cm³ - Thus, mass of sample water = \( 11.7 \, \text{cm}^3 \times 1.00 \, \text{g/cm}^3 = 11.7 \, \text{g} \) Since 1 gram of water is 1 cm³, the sample is 11.7 grams (0.0117 kilograms). Now, calculate the concentration in nanograms per kilogram to convert it into ppb (parts per billion): - \( \text{Concentration} =
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