At the half equivalence point [HA] = [A-] and pH = pKa
<span>if Ka is 5.2e-5 then pKa = pH = 4.28</span>
Answer:
vkhcohvoccf
uxihfoydohfufyfocidicicugxigdixifxtxtduration jfhgxfcixig
cigcih
Explanation:
cihcohcohccohcjjcofidytstitddgggxogxxtdrrtteeeeeiiiixiiitttdooodooxyక్సజిఫ్స్ట్టిగ్గ్స్గ్డ్గ్
The frequency and energy of most energetic of these photons is
Hz and
J respectively.
The high energy photons will have least wavelength. Taking the given less wavelength for calculation of frequency and energy of photons.
λ = 2200 Å
Also, we know, 1 Å =
m
So, λ = 
λ =
<em> </em>m
Now, calculating frequency using the formula -
c = fλ, where c is speed of light, f is frequency and λ is wavelength.
We know, c =
m/s
f = c/λ
f = 
frequency =
Hz
Now, calculating Energy through the formula -
E = hf, where E is energy, h is planck's constant and f is frequency
Value of planck's constant =
Js
E =
*
Energy =
J
Thus, frequency and energy of photons is
Hz and
J respectively.
Learn more about energy of photon -
brainly.com/question/15946945
#SPJ4
Answer:
Mass of carbon = 109.1 g
Explanation:
Given data:
Mass of carbondioxide = 400 g
Mass of carbon = ?
Solution:
Molar mass of carbon = 12 g/mol
Molar mass of CO₂ = 44 g/mol
Mass of carbon in 400g of CO₂:
Mass of carbon = 12 g/mol/44 g/mol × 400 g
Mass of carbon = 109.1 g
Answer: 2800 g
Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number
of particles.
Given mass = 5 kg = 5000 g
1 mole of
produces = 1 mole of 
50 moles of
produces =
of 
Mass of 
2800 g of
is produced from 5.0 kg of limestone.