Moles x Mol mass = mass.
<span>Having looked it up, the mol.mass of U-238 is 238.03g/mol. </span>
<span>7.50 moles x 238.03g/mol. = 1,785.23g/mol</span>
Answer:
28.3 kg
Explanation:
Assuming the ground is level, the normal force equals the weight.
N = mg
277 N = m × 9.8 m/s²
m = 28.3 kg
The definition of a Newton (unit) is an expression of a quantity as a result of a 
object acceleration.
<h3>What is the SI newton unit?</h3>
The Standard International (SI) unit of force is the newton. The letter N is frequently used to shorten the phrase "newton" in physics and engineering documents. In the absence of any other forces, one newton is the force necessary to accelerate a mass of one kilogram at a pace of one meter per second squared.
<h3>What are the equivalents of a newton in terms of mass and acceleration?</h3>
One Newton is the amount of force required to accelerate one kilogram of mass one squared meter per second.
<h3>Is the newton a measure of force?</h3>
The newton, abbreviated N, is the SI unit of force. Base units that are pertinent to force are: The symbol for the length unit of a metre is m. the kilogram (kg), a unit of mass.
learn more about newton here
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Answer:
n₂ = 2.00
Explanation:
Using the Rydberg Energy Equation of 1/λ = R * Z² * (1/n₂² - 1/n₁²)
this is where λ is the wavelength, z is atomic number, n₁ is the initial energy level, n₂ the final energy level and R is the Rydberg constant with a value of ≈ 1.0973 * 10^7 1/m.
If we plug all the given numbers in the the equation we are left with an unknown of n₂, solve for n₂ and your answer will be 2.00
Likely there is a typo in the second option. If the correct year is 1890, that is the right answer.
JJ Thompson in the 1890 decade discovered that the particles that consituted the cathodic rays had a mass much, much smaller than the ligthest atom (the hydrogen), identifying the electron as a particle of the atom.
Regarding the other options:
a) Thompson model was not that the electrons orbited but that the atoms were a solid sphere with the electrons embedded.
c) John Dalton lived was born in 1776
d) Niels Bohr model was that negatively charged particles orbitted a positively charged nucleus.
