Answer: b. the number of electrons
Explanation:
1. 4 is the principal quantum number which describes the size of the orbital. It is represented by n.
2. The electrons are present in p sub shell also called as azimuthal quantum Number: This quantum number describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For p orbital, l=1.
3. The p subshell contains 3 electrons.
Answer: Hz
Explanation: Recall the formula for the speed of light is
where is the speed of light,
is the wavelength, and
is the frequency. Assuming this takes place in a vacuum,
m/s. Now we can solve for frequency
(rounding to 3 sig figs)
Thus, the frequencyis Hz.
Answer:
a) pH will be 12.398
b) pH will be 4.82.
Explanation:
a) The moles of NaOH added = molarity X volume (L) = 2 X 0.01 = 0.02 moles
The total volume after addition of pure water = 0.780+0.01 = 0.79 L
The new concentration of /NaOH will be:
the [OH⁻] = 0.025
pOH = -log [OH⁻] = 1.602
pH = 14 -pOH = 12.398
b) The buffer has butanoic acid and butanoate ion.
i) Before addition of NaOH the pH will be calculated using Henderson Hassalbalch's equation:
pKa=
ii) on addition of base the pH will increase.