Hello!
From tables, we know that the
pKa for Methylamine CH₃NH₂ is 10,61. Now, we can apply the
Henderson-Hasselbach's equation and clear for the ratio of CH₃NH₂ to CH₃NH₃Cl
So, the ratio of CH₃NH₂ to CH₃NH₃Cl should be
0,32Have a nice day!
<span>Na --> Na+ + e- E = +2.71
2H2O + 2 e- --> H2 + 2 OH- E = -0.83
Delta E = 2.71 - 0.83 = 1.88 Volts
You know the reaction is spontaneous because Ecell is positive.
Delta Go = - n F Delta E
Delta Go = - 2mol (96485 J/volt mol) (1.88 V)
Delta go = -3.62X10^5 J/mol = -326 kJ/mol
Yes, it is VERY spontaneous.</span>
<span>The answer is A. This is because sunlight is composed of various wavelengths in the
electromagnetic spectrum. In the visible
light spectrum, red light has a higher frequency
(lower wavelength) than blue light that has a lower frequency (higher wavelength).
Therefore red light has higher energy than blue light hence able to penetrate
more into the atmosphere before scattering, compared to blue light. At sunrise
and sunset, due to the relative angle of
the sun to the observer, the sun rays
have to penetrate a thicker layer to the atmosphere
before reaching the observer</span>