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Ilia_Sergeevich [38]
2 years ago
7

What 2 solutions could help restore the ecosystem back to normal?

Chemistry
1 answer:
Pavel [41]2 years ago
6 0
  • Renewable energy and energetic efficiency. ...
  • The electric vehicle. ...
  • Greater environmental control. ...
  • Air purifiers. ...
  • Graphene filter for water. ...
  • Food sovereignty and agroecology. ...
  • Sustainable development.
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Question 1
olchik [2.2K]

Answer:

Explanation:

nm

4 0
3 years ago
A standard lanthanum solution is prepared by dissolving 0.1968 grams of lanthanum oxide (La2O3) in excess nitric acid and diluti
sweet-ann [11.9K]

Answer:

1.208x10⁻³M and 392.5ppm La(NO3)3

Explanation:

The reaction that occurs is:

La2O3 + 6HNO3 → 2La(NO3)3 + 3H2O

Molarity is defined as the moles of solute (In this case, LaO3) per liter of solution. And ppm, are mg of solute per liter of solution.

To solve this question we must find the moles of La(NO3)3 produced and its mass in milligrams to find molarity and ppm:

<em>Moles La2O3 -Molar mass: 325.81g/mol-</em>

0.1968g * (1mol / 325.81g) = 6.04x10⁻⁴ moles La2O3

<em>Moles La(NO3)3:</em>

6.04x10⁻⁴ moles La2O3 * (2mol La(NO3)3 / 1mol La2O3) = 1.208x10⁻³ moles La(NO3)3

<em>Molarity:</em>

1.208x10⁻³ moles La(NO3)3 / 1L =

<h3>1.208x10⁻³M</h3>

<em>Mass La(NO3)3 -Molar mass: 324.92g/mol-</em>

1.208x10⁻³ moles La(NO3)3 * (324.92g / mol) = 0.392.5g La(NO3)3

In mg:

392.5mg La(NO3)3 / 1L =

392.5ppm La(NO3)3

7 0
3 years ago
2. The picture shows two magnets interacting
hodyreva [135]

Explanation:

The picture shows magnetic force between opposite ends is attractive.

6 0
3 years ago
Which type of orbit does the earth have with the sun ?
777dan777 [17]

Answer:

elliptical orbit

7 0
3 years ago
An idle ball on a hilltop, though not moving, contains _____.
vampirchik [111]

potential energy because it has a potential to roll down the hill, creating kinetic energy. it is idle

6 0
3 years ago
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