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frosja888 [35]
2 years ago
7

40 points, please help I seriously cannot fail this class and I am extremely confused. All you have to do is solve using dimensi

onal analysis. If you can type some form of work that would be helpful. I will go answer a question on yours as well also.

Chemistry
1 answer:
Tomtit [17]2 years ago
5 0

Answer:

the answer to the first is 5.5 meters :)

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When aqueous solutions of Na2SO4 and Pb(NO3)2 are mixed, PbSO4 precipitates. Calculate the mass of PbSO4 formed when 1.25 L of 0
neonofarm [45]

Answer:

The mass of PbSO4 formed 15.163 gram

Explanation:

mole of Pb(NO₃)₂ = 1.25 x 0.05 = 0.0625

mole of Na₂SO₄ = 2 x 0.025 = 0.05

                                      Pb(NO₃)₂ + Na₂SO₄ → PbSO₄ + 2 NaNO₃

( Mole/Stoichiometry )    \frac{0.0625}{1}           \frac{0.05}{1}

                                     = 0.0625     = 0.05

From  (Mole/ Stoichiometry ) we can conclude that Na₂SO₄ is limiting reagent.

Mass of PbSO₄ precipitate = 0.05 x Molecular mass of PbSO₄

                                            = 0.05 x 303.26 g

                                            = 15.163 g

7 0
2 years ago
Can someone help me with questions 4-5 <br> 21 points
sp2606 [1]

4. describe three ways carbon dioxide was removed from the Earth's atmosphere.

Answer: Forests: Photosynthisis helps clear carbon dioxide naturally, Soils naturally store carbon, but agricultural soils are running a big deficit due to intensive use. Because agricultural land is so expansive, Bio-energy with Carbon Capture and Storage (BECCS) is another way to use photosynthesis to combat climate change. However, it is far more complicated than planting trees or managing soils — and it doesn’t always work for the climate.

5. Explain why there is now 21% Oxygen in the Earth's atomosphere compaired to little or no Oxygen in the Earth's atmosphere 4.5 billion years ago.

Answer: cientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.

Sorry its soooo long TwT

8 0
3 years ago
Examine the statement about alchemy
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Answer: B.

Explanation:

7 0
2 years ago
A chemical reaction takes place in which energy is absorbed arrange the characteristics of the reaction in order from start to f
lbvjy [14]
First its ... higher energy of reactants , higher energy of products & you do the same with the lower ones than you do transition state
6 0
3 years ago
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7.) Regarding molecular formula and empirical formula for a particular compound... (A) the subscripts in the empirical formula m
S_A_V [24]

Answer:

Explanation:

i think the anwer would be that its elliptical orbit and the tilt an its axis.

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2 years ago
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