Answer:
Final state of the hydrogen atom is the state where principle quantum number n = 2
Explanation:
When a photon of light having wavelength of 93·73 nm falls on hydrogen atom, the atom absorbs an energy of (h×c)÷93·73 nm
as Energy E = (h×c)÷wavelength
where
h is the Planck's constant
c is the speed of light in vaccum which is 3×
m/s
Energy that is released is (h×c)÷410·1 nm
Let the principle quantum number of the final state of the hydrogen atom be n
According to the Bohr's principle
Energy difference between two states = ΔE =
( (1÷n²) - 1)
as the principle quantum number of the final state is n and principle quantum number of the initial state is 1
∴ ΔE = (h×c)((1÷93·73 nm) - (1÷410·1 nm))
( (1÷n²) - 1) = (h×c)((1÷93·73 nm) - (1÷410·1 nm))
(
( (1÷n²) - 1)) ÷ (h×c) = (1÷93·73 nm) - (1÷410·1 nm)
∴ n≈2
∴ Principle quantum number of the final state is 2
Answers:
Most of the world’s energy comes from what three sources?
Oil, coal, and gas.
These energy sources are called <u>fossil</u> fuels and they are <u>non-renewable</u> resources.
Fuel type: oil
How it's formed: from the remains of ancient marine organisms
Its uses: transportation, industrial power, heating and lighting, lubricants, petrochemical industry, and use of by-products
Fule type: coal
How it's formed: when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial
Its uses: electricity generation, metal production, cement production, chemical production, gasification, and other industrial uses
Fuel type: gas
How it's formed: decomposed organic matter mixed with mud, silt, and sand on the seafloor
Its uses: heating & cooling buildings, cooking foods, fueling vehicles, and electricity generation
Answer:
98.68%
Explanation:
Step 1: Write the balanced equation
KBr + AgNO₃ ⇒ AgBr + KNO₃
Step 2: Calculate the moles corresponding to 814.5 mg (0.8145 g) of AgBr
The molar mass of AgBr is 187.77 g/mol.
0.8145 g × 1 mol/187.77 g = 4.338 × 10⁻³ mol
Step 3: Calculate the moles of KBr needed to produce 4.338 × 10⁻³ moles of AgBr
The molar ratio of KBr to AgBr is 1:1. The moles of KBr needed are 1/1 × 4.338 × 10⁻³ mol = 4.338 × 10⁻³ mol.
Step 4: Calculate the pure mass corresponding to 4.338 × 10⁻³ moles of KBr
The molar mass of KBr is 119.00 g/mol.
4.338 × 10⁻³ mol × 119.00 g/mol = 0.5162 g
Step 5: Calculate the purity of KBr
0.5162 g of KBr are in a 0.5231 g-sample. The purity of KBr is:
P = 0.5162 g/0.5231 g × 100% = 98.68%
A saturated solution is the state of a solution where the solvent has accepted as much of the solute as possible. An unsaturated solution still has room for more of the solute. And I know you didn't ask this, but a supersaturated solution is a solution that has been made to accept more solute than should be possible through external forces, such as heating the solvent to the point where it will accept more solute.
The answer is c. hg (mercury)