1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sladkaya [172]
3 years ago
11

The maximum allowable concentration of lead in drinking water is 9.0 ppb. (a) Calculate the molarity of lead in a 9.0-ppb soluti

on. What assumption did you have to make in your calculation? (b) How many grams of lead are in a swimming pool containing 9.0 ppb lead in 60 m3 of water?
Chemistry
1 answer:
blsea [12.9K]3 years ago
6 0

Answer:

0.54 g of Pb in 60 m³ of [Pb] = 9 ppb

Explanation:

We need to know, that ppb is a sort of concentration that indicates (in value of volume) ng / mL (ppb = parts per billion)

9 ppb means that 9 ng are contained in 1mL of solution

We know that 1mL = 1 cm³

Let's convert 60 m³ to cm³ → 60 m³ . 1×10⁶ cm³ / 1m³ = 6×10⁷ cm³

Then, we can make a rule of three:

1 cm³ has 9 ng of Pb

Therefore in 6×10⁷ cm³ we must have ( 6×10⁷ cm³ . 9ng) / 1 cm³ =

5.4×10⁸ ng

We convert ng to g → 5.4×10⁸ ng . 1 g / 1×10⁻⁹ ng = 0.54 g

You might be interested in
25 grams of radon-222 remains after 15.28 days. How much radon was in the original sample? Write an equation for the decay of ra
Crazy boy [7]

Answer:

half-life = 3.8 days

total time of decay = 15.2 days

initial amount = 100. g

number of half-lives past: 15.2/3.8 = 4 half-lives

4 half-lives = 1/16 remains

100. g x 1/16 = 6.25 g

8 0
3 years ago
Is mountain lions a herbivore
egoroff_w [7]
Mountain lion have to hunt other animals up in the Mountains. Other animals are meat. Therefore mountain lions are carnivores, not herbivores. 

I hope this helped!
If it did I would like it if I got brainliest :)
7 0
3 years ago
Read 2 more answers
Where did you put H an He? What are your reasoning for placement?
aksik [14]

Answer:

On the placement of hydrogen and helium in the periodic system

H1=1

He2=2

3 0
3 years ago
This image shows the development of what climate phenomenon?
Tpy6a [65]

Answer:

Rain shadow

Explanation:

Climate is the average weather condition of a place over a long period of time.

The image shows a rain shadow effect around a mountainous region. The type of rainfall controlled this way is known as an orographic rainfall.

  • On the leeward side which is the opposite side of where the rain cloud forms, there is dryness and lack of rainfall.
  • As moist air rises along the edge of the windward side, cloud forms.
  • This windward side receives a significant amount of rainfall
  • The windward side is hit with cold and dry wind and it is barren.
8 0
3 years ago
Which statement below references interactions between the geosphere, the hydrosphere and the biosphere?
erastovalidia [21]
Ekekoskekeoejekskdodjdod
7 0
3 years ago
Read 2 more answers
Other questions:
  • An ideal monatomic gas at 300 K expands adiabatically to twice its initial volume. Assume that the process is also quasistatic.
    9·1 answer
  • Which human body resembles mitochondria
    15·1 answer
  • What is the force of a 10 kg. and its velocity is 2m/s
    5·1 answer
  • Rank the elements b, be, n, c, and o in order of increasing first ionization energy. (use the appropriate <, =, or > symbo
    5·1 answer
  • When aqueous solutions of HCl and NaOH are mixed together in a calorimeter, the temperature of the solution increases. The react
    10·1 answer
  • The planet mars has two moons, deimos and phobos. phobos is about 9,000 km from mars and is about six times more massive than de
    8·1 answer
  • What is the specific latent heat of fusion for a substance that takes 550 kJ to melt 14 kg at 262 K?
    7·1 answer
  • Please Help Me! Check if my answer is correct and if not can you please explain the correct answer
    6·1 answer
  • Cesium-137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-137 is 30.2 years. How much tim
    15·1 answer
  • Where did Rutherford believe the protons were found?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!