Answer:
The concentration of the solution is 1.068×10⁻⁴M
Explanation:
Hello,
To find the concentration of the solution, we'll have to use Beer-Lambert law which states absorption is directly proportional to the concentration of the solution.
Beer-Lambert law = A = εCL
A = absorption = 2 - log₁₀%T = 2 - log₁₀(34)
A = 2 - 1.5314 = 0.47
A = 0.47
ε = molar absorption coefficient = 4400
C = concentration of the solution
L = path length = 1cm
A = εcl
C = A / εl
C = 0.47 / 4400 × 1
C = 1.068×10⁻⁴M
The concentration of the solution is 1.068×10⁻⁴M
Answer:
The process describes the source of energy of the Sun such that it shines as a result of nuclear fusion of hydrogen taking place.
Explanation:
The Sun generates energy by hydrogen within the Sun undergoing nuclear fusion to form helium.
Nuclear fusion reaction involves combining of two or more atomic nuclei to produce one or more completely different atomic nuclei as well as protons or neutrons, with a loss or gain of mass and the release or absorption of energy.
The process whereby four hydrogen atoms combine to form one helium atom with a mass deficit, which is accounted for by the release of energy, result in the high intense light of the Sun.
Answer:
pH = 4,70
Explanation:
For bromocresol, as HX is yellow and X⁻ is blue, the indicator will be a perfect green color when HX = X⁻.
Using Henderson-Hasselbalch formula:
pH = pka + log [X⁻]/[HX] <em>(1)</em>
Where pka is -log ka = -log2,0x10⁻⁵ = 4,70
As HX = X⁻, [HX] / [X⁻] = 1
Replacing in (1):
pH = 4,70 + log 1
pH = 4,70 + 0
<em>pH = 4,70</em>
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I hope it helps!
Hello!
1)Through vacuum, the fastest method of thermal energy transfer would be radiation. This kind of thermal energy transfer consists in energy carried out from a radiant body by electromagnetic waves at the speed of light e.g. the heat from the Sun. Radiation doesn't involve contact between the two bodies by any solid or fluid.
In the vacuum, the fastest way for heat to be transferred would be through radiation because the electromagnetic waves would be faster than any other heat transfer method and because there is no contact as there is no solid or fluid between the two bodies.
2) Through a gas: The fastest method of thermal energy transfer would be convection. Convection is the heat transfer by the real movement of molecules of a fluid. A gas is a fluid, and it would experience this kind of energy transfer as the molecules move.
Earth's atmosphere experience this kind of energy transfer, as large air masses move by convection, creating wind currents.
3) Through a solid: The fastest method of thermal energy transfer would be conduction. Conduction consists in the heat transfer between two bodies by molecular agitation but there is no movement involved i.e. the bodies are not fluids.
In the case of a solid, this kind of energy transfer will depend on a constant known as Thermal Conductivity, which allows assessing the ability to transfer heat through a solid.
Have a nice day!
Answer:
3.5 mol
Explanation:
Step 1: Given data
Moles of HCl: 7.0 mol
Step 2: Write the balanced equation
Fe(s) + 2 HCl(aq) ⇒ FeCl₂(aq) + H₂(g)
Step 3: Calculate the moles of H₂ gas produced from 7.0 moles of HCl
According to the balanced equation, the molar ratio of HCl to H₂ is 2:1.
7.0 mol HCl × 1 mol H₂/2 mol HCl = 3.5 mol H₂
