Answer:
In this case the mass number would be 11.
Explanation:
The mass number of an element is the sum of the protons and neutrons. The number of neutrons for a given element is the only number that can change and still have the identity of the element stay the same, (because the atomic number is the number of protons).
Answer:
is dissociation constant and the value of
is 4.98.
Explanation:
The pH of the solution = 2.95 M
![pH=-\log[H^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%5BH%5E%2B%5D)
![2.95=-\log[H^+]](https://tex.z-dn.net/?f=2.95%3D-%5Clog%5BH%5E%2B%5D)
..[1]
Concentration of unknown monoprotic acid = C = 0.1224 M

Initially
C 0 0
At equilibrium
(C-x) x x
The expression of a dissociation reaction can be written as;
![K_a=\frac{[A^-][H^+]}{[HA]}](https://tex.z-dn.net/?f=K_a%3D%5Cfrac%7B%5BA%5E-%5D%5BH%5E%2B%5D%7D%7B%5BHA%5D%7D)

( from [1])


The value of
:
![pK_a=-\log[K_a]](https://tex.z-dn.net/?f=pK_a%3D-%5Clog%5BK_a%5D)
![=-\log[1.038\times 10^{-5}]=4.98](https://tex.z-dn.net/?f=%3D-%5Clog%5B1.038%5Ctimes%2010%5E%7B-5%7D%5D%3D4.98)
is dissociation constant and the value of
is 4.98.
Answer:
Trucks, airplanes, and trains are used to transport people and supplies from one place to another.
Explanation:
According to Einstein the energy of photon is given by the equation,
E = hν = h . c/λ
where h is Planck's constant, c is the speed of light, ν is the frequency of light and λ is the wavelength of light.
Given, wavelength of photon = 413 nm = 413 x 10⁻⁹ m
Conversion factor: 1 nm = 10⁻⁹ m
c = 3 x 10⁸ m/s
h = 6.626× 10⁻³⁴ J.s
Substituting the data into the equation we get,
E = h . c/λ
E = 6.626× 10⁻³⁴ J.s x (3 x 10⁸ m/s) / 413 x 10⁻⁹ m
E = 4.8 x 10⁻¹⁹ J
The energy of this blue light is 4.8 x 10⁻¹⁹ J
Answer:
electrons (can i have brainliest)
Explanation: