Question
In: Chemistry
Suppose a group of volunteers is planning on building a park near a local lake. The...
Suppose a group of volunteers is planning on building 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.
a) If a 15.7 cm3 sample of lake water is found to have 164.5 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?
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 2.74 days to remove 41.90 kg of As from a water source.
b) Calculate the total mass (in kg) of arsenic in the lake that the company will have to remove if the total volume of water in the lake is 0.710 km3?
c) Based on the company\'s claim and the concentration of arsenic in the lake, how many years will it take to remove all of the arsenic from the lake, assuming that there are always 365 days in a year?
Solutions
queen_honey_blossom answered 1 year agoRelated Solutions
Suppose a group of volunteers is planning on building a park near a local lake. The...
Suppose a group of volunteers is planning on building 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.
a) If a 15.7 cm3 sample of lake water is found to have 164.5 ng
As, what is the concentration of arsenic in the sample in parts per
billion (ppb), assuming that the density of the...
1. A group of volunteers are planning a dinner to raise money for a charity. They...
1. A group of volunteers are planning a dinner to raise money
for a charity. They have excellent relations with the chair of the
fund-raising committee. They want the dinner to be a big success
but unfortunately, they have little experience in planning dinners
and are not sure which tasks they need to do in order to succeed.
Kai, the chair of the committee wants to guide them but he has
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Suzy’s Cool Treatz is a snow cone stand near the local park. To plan for the...
Suzy’s Cool Treatz is a snow cone stand near the local
park. To plan for the future, the owner wants to determine her cost
behavior patterns. She has the following information available
about her operating costs and the number of snow cones
served.
Month
Number of snow cones
Total operating costs
January
3,500
$5,000
February
3,800
$4,800
March
5,000
$6,800
April
3,600
$5,450
May
4,700
$6,200
June
4,250
$5,950
Suzy uses the high-low method to determine her operating
cost equation....
Suzy’s Cool Treatz is a snow cone stand near the local park. To plan for the...
Suzy’s Cool Treatz is a snow cone stand near the local
park. To plan for the future, the owner wants to determine her cost
behavior patterns. She has the following information available
about her operating costs and the number of snow cones
served.
Month
Number of snow cones
Total operating costs
January
3,500
$5,000
February
3,800
$4,800
March
5,000
$6,800
April
3,600
$5,450
May
4,700
$6,200
June
4,250
$5,950
Suzy uses the high-low method to determine her operating
cost equation....
You and a group of friends are planning to visit a theme park, which charges $60...
You and a group of friends are planning to visit a theme park,
which charges $60 for admission, $80 for a two-day pass, and $90
for a three-day pass. Your friends are interested in spending a lot
of time there, but they’re worried about paying a lot of money. You
explain the concept of marginal cost, which helps them see that the
additional day is a good value.
1. The average cost per day of a three-day pass
is $ per person....
Suppose Tokyo is planning to construct a new public park. Based on some market research, they...
Suppose Tokyo is planning to construct a new public park. Based
on some market research, they have determined that the town’s 50
residents can be divided into two types with respect to their
benefit from this public good. 20 of the town’s residents are of
Type 1 and the other 30 residents are of Type 2. Each resident's
individual demand for acres of park space is given by:
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Type 2: QD = 40...
A group of volunteers are randomly divided into two groups. One group of participants takes a...
A group of volunteers are randomly divided into two groups. One
group of participants takes a pill each morning for a year which
contains antioxidants (Vitamins A, C, E, etc), while the other
group takes a placebo pill for the same time period. Following this
they are measured on a problem solving task given under stressful
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Teton Village, Wyoming, near Grand Teton Park and Yellowstone Park, contains shops, restaurants, and motels. The...
Teton Village, Wyoming, near Grand Teton Park and Yellowstone
Park, contains shops, restaurants, and motels. The village has two
peak seasons---winter, for skiing on the 10,000-foot slopes, and
summer, for tourists visiting the parks. The number of visitors(in
thousands) by quarter for five years can be found in Data Table Two
below
1.Develop the typical seasonal pattern for Teton Village
2. Determine the seasonally adjusted number of visitors for
winter 2011.
Data Table Two
Year
Quarter
Number of
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Jensen Company owns a building in a suburban industrial park. It purchased the building four years...
Jensen Company owns a building in a suburban industrial park. It
purchased the building four years ago for $3 million. It is now
deciding whether to lease the building or to use it as a
distribution center. It could be rented immediately. Given today’s
market conditions, rental income of $120,000 per year would be
expected. To convert the building to make it useful as a
distribution center would require an immediate expenditure of
$400,000. Having the distribution center at this...
Jensen Company owns a building in a suburban industrial park. It purchased the building four years...
Jensen Company owns a building in a suburban industrial park. It
purchased the building four years ago for $3 million. It is now
deciding whether to lease the building or to use it as a
distribution center. It could be leased immediately. Given today’s
market conditions, lease income of $120,000 per year would be
expected. To convert the building to make it useful as a
distribution center would require an immediate expenditure of
$400,000. Having the distribution center at this...
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