Answer:
The correct option is option (D).
Therefore the concentration of 
is 1.8×10⁻¹⁰ M and it is basic in nature.
Explanation:
List of pH:
- If pH of a solution is 7, then solution is neutral.
- If pH of a solution is grater than 7, then solution is basic.
- If pH of a solution is less than 7, then solution is acidic.
pH of a solution is = - log₁₀[H₃O⁺]
We know that,
[H₃O⁺][OH⁻] = 
= 
(at 25°C)
Taking log both sides
log ([H₃O⁺][OH⁻]) =log =log
⇒log[H₃O⁺]+log[OH⁻] = log = -14 log 10
[since log(mn)= log m + log n, 
]
⇒ - log[H₃O⁺] - log[OH⁻] = - (-14) [ log 10 =1]
⇒pH+pOH =14.
Given that,
The concentration of OH⁻ is 5.5 × 10⁻⁵ M
[H₃O⁺][OH⁻] = =
⇒[H₃O⁺] 5.5 × 10⁻⁵ M=10⁻¹⁴
![\Rightarrow [H_3O^+]=\frac{10^{-14}}{5.5\times 10^{-5}}](https://tex.z-dn.net/?f=%5CRightarrow%20%5BH_3O%5E%2B%5D%3D%5Cfrac%7B10%5E%7B-14%7D%7D%7B5.5%5Ctimes%2010%5E%7B-5%7D%7D)
⇒[H₃O⁺] = 1.8×10⁻¹⁰ M
Now check the pH of the solution.
[H₃O⁺] = 1.8×10⁻¹⁰
Taking log both sides
log [H₃O⁺] =log( 1.8×10⁻¹⁰)
⇒ -log [H₃O⁺] = - log( 1.8×10⁻¹⁰)
⇒ pH = - log( 1.8×10⁻¹⁰)
⇒ pH =9.7.
So the nature of solution is basic.
Therefore the concentration of is 1.8×10⁻¹⁰ M and it is basic in nature.
Given that,
Temperature, T = 1500 K
Wavelength, 
To find,
The energy of one photon of this light.
Solution,
We know that, the energy of a photon is given by the formula as follows :
So, the required energy is 
.
Answer : The correct option is, (A) ![[H_3O^+]=[OH^-]](https://tex.z-dn.net/?f=%5BH_3O%5E%2B%5D%3D%5BOH%5E-%5D)
because one of each is produced every time an ![[H^+]](https://tex.z-dn.net/?f=%5BH%5E%2B%5D)
transfers from one water molecule to another.
Explanation :
As we know that, when the two water molecule combine to produced hydronium ion and hydroxide ion.
The balanced reaction will be:
Acid : It is a substance that donates hydrogen ion when dissolved in water.
Base : It is a substance that accepts hydrogen ion when dissolved in water.
From this we conclude that, the hydrogen ion are transferred from one water molecule to the another water molecule to form hydronium ion and hydroxide ion. In this reaction, one water molecule will act as a base and another water molecule will act as an acid.
Hence, the correct option is, (A)
Answer: 100.
Explanation:
1) The subscripts to the right of each element (symbol) in the chemical formula tells the number of atoms of that element present in one unit formula.
2) The unit formula of C₄H₄S₂ is equal to 1 molecule.
3) Therefore, there are 4 carbon atoms, 4 hydrogen atoms and 2 sulfur atoms in each molecule of C₄H₄S₂.
4) Then, you just have to multiply the corresponding subscript of the element times the number of molecules (25 in this case) to find the number of atoms of that kind.
5) These are the calculations for each element in the molecule C₄H₄S₂.
i) C: 4 × 25 = 100
ii) H: 4 × 25 = 100
iii) S: 2 × 25 = 50.
6) The question is about H only, so the answer is that there are 100 hydrogen atoms in 25 molecules of C₄H₄S₂.
55.9 kPa; Variables given = volume (V), moles (n), temperature (T)
We must calculate <em>p</em> from <em>V, n</em>, and <em>T</em>, so we use <em>the Ideal Gas Law</em>:
<em>pV = nRT</em>
Solve for <em>p</em>: <em>p = nRT/V</em>
R = 8.314 kPa.L.K^(-1).mol^(-1)
<em>T</em> = (265 + 273.15) K = 538.15 K
<em>V</em> = 500.0 mL = 0.5000 L
∴ <em>p</em> = [6.25 x 10^(-3) mol x 8.314 kPa·L·K^(-1)·mol^(-1) x 538.15 K]/(0.5000 L) = 55.9 kPa
