Answer:
The vernal equinox occurs on March 20 or March 21 each year and signals the start of spring in the Northern Hemisphere (and fall in the Southern Hemisphere). The Earth tilts at an angle of 23.5 degrees on its axis relative to its plane of orbit around the sun. My source is history.com A, i think
Explanation:
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In Florida, more than 20,000 crashes are alcohol related
Answer:
The answer to your question is X = 0.072
Explanation:
Data
X I₂ = ?
mass of I₂ = 55.6 g
mass of hexane = 245 g
Formula
X I₂ = (moles of Iodine) / (moles of iodine + moles of hexane)
Process
1.- Convert the mass of reactants to moles
atomic mass of I₂ = 2 x 127 = 254g
atomic mass of hexane = (12 x 6) + (14 x 1) = 86 g
254 g ---------------- 1 mol
55.6 g------------- x
x = (55.6 x 1)/254
x = 0.22 moles of I₂
86 g ------------- 1 mol
245 g ------------- x
x = (245 x 1)/86
x = 2.84 moles
2.- Calculate the mole fraction of I₂
X = 0.22 / (0.22 + 2.84)
X = 0.22 / 3.07
X = 0.072
The angular momentum of an electron in the third Bohr orbit of a hydrogen atom is given by mvr=3h÷2π
<h3>What is momentum?</h3>
Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving.
Bohr never assumed stable electronic orbits with the electronic angular momentum quantized as
l=mvr =
Quantization of angular momentum means that the radius of the orbit and the energy will be quantized as well.
Bohr assumed that the discrete lines seen in the spectrum of the hydrogen atom were due to transitions of an electron from one allowed orbit/energy to another.
Learn more about momentum here:
https://brainly.in/question/38837394
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As we know that <span>Boron has 6 valence electrons
So it does not have to fill a complete octet. it just need two electrons
Thus B(CH3)3 will have only 3 electron domains, and it will constitute</span> a trigonal structure.
shown below
hope it helps