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alexandr1967 [171]
2 years ago
9

How many moles of oxygen are required to react with 12 moles of FeS2?

Chemistry
1 answer:
Radda [10]2 years ago
3 0
19 moles of O2 probably
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He equation for the dissociation of pyridine is
sergeinik [125]

Answer:

10.10

Explanation:

Step 1: Write the basic dissociation reaction for pyridine

C₅H₅N(aq) + H₂O(l) ⇌ C₅H₅NH⁺(aq) + OH⁻(aq)      Kb = 1.9 × 10⁻⁹

Step 2: Calculate [OH⁻]

For a weak base, we will use the following expression.

[OH⁻] = √(Cb × Kb) = √(9.2 × 1.9 × 10⁻⁹) = 1.3 × 10⁻⁴ M

Step 3: Calculate pOH

We will use the definition of pOH.

pOH = -log [OH⁻] = -log 1.3 × 10⁻⁴ = 3.9

Step 4: Calculate pH

We will use the following expression.

pH = 14 - pOH = 14 - 3.9 = 10.10

3 0
2 years ago
Describe how changing the particles changed the atom
Zanzabum
Bonds between atoms break and new ones form and energy is either given out or taken in
5 0
2 years ago
What is the net ionic charge of a calcium ion?
vaieri [72.5K]

Answer:

Ca generally loses two electrons from its outer shell to form a Ca2+ ion.

5 0
3 years ago
In the experiment "Beer-Lambert’s Law and Spectrophotometry", you prepared a calibration plot similar to the one pictured below.
dexar [7]

Answer:

0.025M

Explanation:

As you must see in your graph, each concentration of the experiment has an absorbance. Following the Beer-Lambert's law that states "The absorbance of a solution is directely proportional to its concentration".

At 0.35 of absorbance, the plot has a concentration of:

<h3>0.025M</h3>
8 0
3 years ago
When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe
gulaghasi [49]

Answer:

B

Explanation:

i think with exothermic reactions heat is released

this is what i looked up

hope this helps i took chem last year and think this is what i learned

7 0
2 years ago
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