According to the balanced equation of the reaction:
H2X (aq) +2 NaOH (aq) → Na2X (aq) + 2H2O(l)
First, we have to get the no. of moles of H2X:
no.of moles of H2X = weight / molar mass
when we have the H2X weight = 0.1873 g & the molar mass H2X = 85 g/mol
So by substitution:
∴ no.of moles of H2X = 0.1873 /85
= 0.0022 mol
-then, we need to get no.of moles of NaOH:
from the balanced equation, we can see that 1 mol H2X = 2 mol NaOH
∴ no.of moles of NaOH = no.of moles of H2X *2
= 0.0022 * 2 = 0.0044 mol
So we can get the volume per litre from this formula:
M (NaOH) = no.of moles NaOH / Volume L
So by substitution:
0.1052 = 0.0044 / Volume L
∴Volume = 0.042 L *1000 = 42 mL
Answer:
B. 
Explanation:
Ionization energy is the minimum amount of energy which is required to knock out the loosely bound valence electron from the isolated gaseous atom.
The expression for the energy of an electron in the nth orbit is:-
For transitions:
Given, 
<u>Ionization energy,
</u>
Answer:
1728 kg is the mass of air for the room
Explanation:
An exercise of unit conversion.
The volume of the room will be:
24 m . 15 m . 4m = 1440 m³
Density of air is 1.20 g/L which means that in 1L, there is contained 1.20 g of air.
1L = 1dm³
1m³ = 1000 dm³
1440 m³ . 1000 = 1440000 dm³ ⇒ 1.44x10⁶ L
Density of air = 1.20 g/L = mass of air / volume of air
1.20 g/L = mass of air / 1.44x10⁶ L
1.20 g/L . 1.44x10⁶ L = mass of air → 1728000 grams
1 g = 1x10⁻³ kg
1728000 g / 1000 = 1728 kg
The octet rule states that the atoms want 8 valence electrons to achieve stability. These noble gasses already have 8 valence electrons.
Answer:
cholesterol
Explanation:
<u>Cholesterol is a sterol . It is biosynthesized by the animal cells and acts as an essential component of the structure of the animal cell membranes.
</u>
Cholesterol serves also as precursor for biosynthesis of the steroid hormones,vitamin D and bile acid. It is the principal sterol which is synthesized by all the animals.
<u>Elevated levels of the cholesterol in the body's blood can lead to atherosclerosis that increases risk of heart attack by restricting the blood flow as it gets accumulated in the blood vessels.</u>
