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Misha Larkins [42]
3 years ago
13

Help with number 20-22 please

Chemistry
1 answer:
SSSSS [86.1K]3 years ago
4 0
18. c
19. A
20. decomposition reaction 
21. 4 
22. 0.04%

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A brown coating appears on the outside of the nail.what do you think this is?
Talja [164]

Answer:

Rusting

I guess

Explanation:

Cause in iron if a brown coating appears it is called rusting

8 0
2 years ago
A sample compound contains 9.11 g Ni and 5.89g F. What is the empirical formula of this compound?
Alexxx [7]

The empirical formula of the compound is C. NiF₂.

<em>Step 1</em>. Calculate the <em>moles of each element</em>

The empirical formula is the simplest whole-number ratio of atoms in a compound.

The ratio of atoms is the same as the ratio of moles.

So, our job is to calculate the molar ratio of Ni to F.

Moles of Ni = 9.11 g Ni × (1 mol Ni /(58.69 g Ni) = 0.1552 mol Ni

Moles of F = 5.89 g F × (1 mol F/19.00 g F) = 0.3100 mol F

<em>Step 2</em>. Calculate the <em>molar ratio</em> of the elements

Divide each number by the smallest number of moles

Ni:F = 0.1552:0.3100 = 1:1.997 ≈ 1:2

<em>Step 3</em>: Write the <em>empirical formula</em>

EF = NiF₂

8 0
3 years ago
Read 2 more answers
How is humility related to air pressure
Gnom [1K]
Humid air has higher pressure because of the heaviness of water humid air is lighter so it has lower pressure.
5 0
3 years ago
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Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3NO2(g)+H2O(l)→2HNO3(l)+
Vera_Pavlovna [14]

Answer:

5 moles of NO₂ will remain after the reaction is complete

Explanation:

We state the reaction:

3NO₂(g) + H₂O(l) → 2HNO₃(l) + NO(g)

3 moles of nitric oxide can react with 1 mol of water. Ratio is 3:1, so we make this rule of three:

If 3 moles of nitric oxide need 1 mol of water to react

Then, 26 moles of NO₂ may need (26 .1) / 3 = 8.67 moles of H₂O

We have 7 moles of water but we need 8.67 moles, so water is the limiting reactant because we do not have enough. In conclusion, the oxide is the reagent in excess. We can verify:

1 mol of water needs 3 moles of oxide to react

Therefore, 7 moles of water  will need (7 .3)/1 = 21 moles of oxide

We have 26 moles of NO₂ and we need 21, so we still have oxide after the reaction is complete. We will have (26-21) = 5 moles of oxide that remains

5 0
2 years ago
Help me please i need the answer now<br>(nonsense report)​
rusak2 [61]

Answer:

Quantitative

  • Words, Measurement, Numbers, Charts, Instruments, Quantity, Data

Qualitative

  • Touch, Quality, Hear, Senses, Description, Exact, Narrative, Analyze

Explanation :

Quantitative Data

  • Can't measure
  • Has numerical value
  • Can campare
  • Do not depend on human eye

Qualitative Data

  • Can't measure
  • Don't have numerical value
  • Can't campare
  • Depend on human eye
3 0
3 years ago
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