The molar heat capacity is the heat capacity per unit amount (SI unit: mole) of a pure substance and the specific heat capacity, often called simply specific heat, is the heat capacity per unit mass of a material.
Question:
Each liter of air has a mass of 1.80 grams. How many liters of air are contained in 2.5 x103) kg of air?
Answer:
11.48106 L
Proton mass = 1.00728 amu
neutron mass = 1.0086 amu
electron mass = 0.000549 amu
so the mass is :
(7 * 1.00728) - (7 * 1.0086) - (7 * 0.000549) - 14.003074
= 0.11235 amu
Answer:
ΔE = 13.056 ev
Explanation:
Energy associated with nth state is,
En = -13.6/n²
For n = 1
E₁ = -13.6 / 1²
E₁ = -13.6/1
E₁ = -13.6 ev
Kinetic energy of electron = -E₁ = 13.6 ev
For n = 5
E₅ = -13.6 / 5²
E₅ = -13.6/25
E₅ = -0.544 ev
Kinetic energy of electron = -E₅ = 0.544 ev
Wavelength of radiation emitted:
ΔE = hc/λ = E₅ - E₁
by putting values,
ΔE = -0.544ev - (-13.6 ev )
ΔE = 13.056 ev
You need a list of elements to compare.
The procedure is to wirte the electron configuration and compare the number of electrons in the valence electron shell.
I will work with this list, to show you the procedure
(1) tin
(2) sulfur
(3) arsenic
(4) fluorine
element atomic number number of abbreviated electron
electrons configuration
tin 50 50 [Kr] 5s^2 4d^10 5p2
sulfur 16 16 [Ne] 3s^2 3p^4
arsenic 33 33 [Ar] 4s^2 3d^10 4p^3
fluorine 9 9 [He] 2s^2 2p^5
The valence electrons are those in the last shell.
So, fluorine has 2 + 5 = 7 valence electrons, while tin has 2 + 2 = 4, sulfur has 2 + 4 = 6 and aersenic has 2 + 3 = 5.
Therefore, the answer is fluorine.