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Paha777 [63]
3 years ago
9

How will carbon behave at room temperature?

Chemistry
1 answer:
Elena-2011 [213]3 years ago
5 0
Carbon is not very reactive at room temperature 
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If 38.5 grams of potassium react with excess oxygen gas, how many grams of potassium oxide can be produced? 4K + O2 yields 2K2O
Lera25 [3.4K]

Answer:

46.40 g.

Explanation:

  • It is a stichiometric problem.
  • The balanced equation of the reaction: 4K + O₂ → 2K₂O.
  • It is clear that 4.0 moles of K reacts with 1.0 mole of oxygen produces 2.0 moles of K₂O.
  • We should convert the mass of K (38.5 g) into moles using the relation:

<em>n = mass / molar mass,</em>

n = (38.5 g) / (39.098 g/mol) = 0.985 mole.

<em>Using cross multiplication:</em>

4.0 moles of K produces → 2.0 moles of K₂O, from the stichiometry.

0.985 mole of K produces → ??? moles of K₂O.

∴ The number of moles of K₂O produced = (0.985 mole) (2.0 mole) / (4.0 mole) = 0.4925 mole ≅ 0.5 mole.

  • Now, we can get the mass of K₂O:

∴ mass = n x molar mass = (0.5 mole) (94.2 g/mol) = 46.40 g.

6 0
2 years ago
You could also graph decay time (in seconds or minutes) vs. number of radioactive nuclei. How would this graph differ from the g
Tatiana [17]
Only one of the listed choices are correct here:
<span><em>The x-axis would change title and values.</em>
</span>
6 0
3 years ago
Read 2 more answers
An example of gaining potential energy
aleksandr82 [10.1K]

Answer:

An example for gaining potential energy would be: A glass bottle on the top of a high shelf would have more high potential energy than a glass bottle on the middle or bottom shelf because it has a long way or more farther to fall down or brake.

Explanation:

Remember Potential Energy is the restored energy of an object has.

I hope this helps you!

5 0
3 years ago
How to do lewis dot structure of nh3conh3
wlad13 [49]

Answer:

i'm not really sure i cant help today try a different question that i can help u with

Explanation:

3 0
2 years ago
A student places an object on a balance. Which measurement might the student record based on the balance reading? A. 2.4 kilogra
gtnhenbr [62]
A would be the correct answer
8 0
1 year ago
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