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Zigmanuir [339]
3 years ago
15

What is the pH of a solution with a concentration of 2.4 × 10-5 molar H3O+? Show, or explain, the work used to solve this proble

m.
Chemistry
2 answers:
MrRissso [65]3 years ago
7 0
pH=-log|H_{3}O^{+}|\\\\
pH=-log2.4*10^{-5}=-(log2.4+log10^{-5})=-(0,38-5)=-(-4.62)\\\\
pH=4.62
Rina8888 [55]3 years ago
4 0

Answer:

The pH of the solution is 4.61.

Explanation:

The pH of the solution is defined as negative logarithm of H_3O^+ ion concentration.

pH=-\log[H_3O^+]

The concentration of H_3O^+=2.4\times 10^{-5} molar

pH=-\log[2.4\times 10^{-5} M]=4.61

The pH of the solution is 4.61.

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KNO3(s) --> K+(aq) + NO3-(aq)
ella [17]

Answer:

KNO₃(s) + 35,1 kJ → K⁺(aq) + NO₃⁻(aq)

Explanation:

In the reaction:

KNO₃(s) → K⁺(aq) + NO₃⁻(aq)

The <em><u>heat absorbed</u></em> for the reaction (Because the temperature decreases) is:

Q = C×m×ΔT

Where C is specific heat (4,18J/g°C); m is mass (100g); ΔT is (30,0°C-21,6°C = 8,4°C)

Replacing:

Q = 4,18J/g°C×100g×8,4°C

<em><u>Q = 3511 J</u></em>

Now, moles of KNO₃ are:

10,1g×(1mol / 101g) = <em><u>0,1 moles.</u></em>

Heat of solution in kJ/mol is:

3,511 J / 0,1 mol = <em><u>35,1 kJ</u></em>

As the heat was absorbed for the reaction, right answer is:

<em>KNO₃(s) + 35,1 kJ → K⁺(aq) + NO₃⁻(aq)</em>

That means the reaction needs the heat to occurs.

I hope it helps!

6 0
3 years ago
How might the oceans on early earth have formed?
baherus [9]
Gradual leakage of water stored in hydrate minerals of Earth's<span> rocks could </span>have formed<span> a portion of its water. Water </span>may<span> also </span>have<span> come from volcanism: water vapor in the atmosphere that originated in volcanic eruptions </span>may have<span> condensed to form rain, slowly filling </span>Earth's<span> oceanic basins. So, the answer would be C.

I hope this helped! Good luck :)</span>
3 0
3 years ago
Read 2 more answers
If you have 45.6mL of a liquid and its
tankabanditka [31]
The density of the liquid is 1.027g/cm³

D=M/V
D=46.83/45.6
D=1.027g/cm³
4 0
3 years ago
How many grams are there in 10.0 moles of Al2O3?
irinina [24]

Explanation:

1 mole is equal to 1 moles Al2O3, or 101.961276 grams.

8 0
3 years ago
How many moles of helium gas are contained in a 4.0 L flask at STP
Ratling [72]
First, you convert liters to moles. 
Usually you have to go to grams but this is STP.

Get moles directly by dividing the 4 by STP (22.4)
\frac{4}{22.4} =0.17857142857
About 1.8*10^{-1} or 0.18 moles whichever your teacher prefers

3 0
3 years ago
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