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forsale [732]
1 year ago
7

A certain solution has a molarity of m = 7. 30 mol/l and has a volume of v = 0. 760 l. What is the value of n?

Chemistry
1 answer:
nydimaria [60]1 year ago
7 0

The value of n (number of moles of solute) will be 5.55 moles.

Molarity is the measure of the concentration of a solution. It is the number of moles of a solute in a specific volume of solution. The volume should always be in Litres. Molarity is denoted by M.

Moles are the unit of measurement of the mass any substance holds. It is the SI unit. It is denoted by n.

According to the question

Molarity of solution = 7. 30 mol/L

Volume of solution = 0.760 L

Formula for molarity (M) = number of moles of solute (n) / Volume of solution

To find the number of moles, it can be rewritten as : n = M × V

Therefore n = 7. 30 mol/L ×  0.760 L

n = 5.55 moles

To know more about molarity, here

brainly.com/question/8732513

#SPJ4

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sashaice [31]

Ephedrine, a central nervous system stimulant, is used in nasal sprays as a decongestant. This compound is a weak organic base:

C10H15ON (aq) + H2O (l) -> C10H15ONH+ (aq) + OH- (aq)

A 0.035 M solution of ephedrine has a pH of 11.33.

a) What are the equilibrium concentrations of C10H15ON, C10H15ONH<span>+, and OH-</span>?

b) Calculate <span>Kb</span> for ephedrine.

c(C₁₀H₁₅NO) = 0,035 M.<span>
pH = 11,33.
pOH = 14 - 11,33 = 2,67.
[OH</span>⁻] = 10∧(-2,67) = 0,00213 M.<span>
[OH</span>⁻] = [C₁₀H₁₅NOH⁺] = 0,00213 M.<span>
[</span>C₁₀H₁₅NO] = 0,035 M - 0,00213 M = 0,03287 M.<span>
Kb = [OH</span>⁻] · [C₁₀H₁₅NOH⁺] / [C₁₀H₁₅NO].<span>
Kb = (</span>0,00213 M)² / 0,03287 M = 1,38·10⁻⁴.

3 0
3 years ago
Which of the following solutions would have [Fe3+] = 0.020 M?
Shalnov [3]

Answer:

None of the given options

Explanation:

Let's go case by case:

A. No matter the volume, the concentration of Fe(NO₃)₃ (and thus of [Fe³⁺] as well) is 0.050 M.

B. We can calculate the moles of Fe₂(SO₄)₃:

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Given that there are two Fe⁺³ moles per Fe₂(SO₄)₃ mol, in the solution we have 0.032 moles of Fe⁺³. With that information in mind we <u>can calculate [Fe⁺³]</u>:

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C. Analog to case A., the molar concentration of Fe⁺³ is 0.040 M.

D. Similar to cases A and C., [Fe⁺³] = 0.010 M.

Thus none of the given options would have [Fe⁺³] = 0.020 M.

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3 years ago
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2- when the balloon contains 0.15 moles of Co2 gas so:

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Answer:

<h3>The answer is 32 g/cm³</h3>

Explanation:

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density =  \frac{mass}{volume} \\

From the question

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We have

density =  \frac{768}{24}  \\

We have the final answer as

<h3>32 g/cm³</h3>

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