<span>They have similar or common ancestor. The similarities inherited from the common ancestor as in the case of homologous organs. In evolutionary biology a group of organisms share a common descent if they have a common ancestor. There are many other examples like in the case of hemoglobin to prove the theory of common ancestor</span>
Answer:
The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.
Explanation:
The energy of nth energy levels of the H atom is given as:
Energy of the seventh energy level =
Energy of the seventh energy level =
Energy of the light emitted will be equal to the energy difference of the both levels.
Wavelength corresponding to energy E can be calculated by using Planck's equation:
The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.
Answer:
The dog weighs 29,88 lbf at the top of the Everest
Explanation:
The difference between mass and weight is that <em>mass is the amount of matter in a material</em>, while <em>weight is a measure of how the force of gravity acts upon that mass.</em>
So mass remains constant always, while weight depends on gravity. At the same time, on Earth, gravity varies slightly depending on the distance to the center of Earth. At the top of Mountain Everest, gravity has a value of 32,042 ft/s2 (normally we use 32, 174 ft/s3 as the average gravity value of Earth) so the weight of the dog will be:
W=m*g.............
<em>Note that normally 1 lbm </em><u><em>has a weight</em></u><em> of 1 lbf because 1 lbf = 32,174 lbmft/s^2 (the average value of gravity in Earth)</em>
Answer:
3.56x10²³ atoms
Explanation:
To solve this question we need first to determine the moles of iron (II) chloride, FeCl₂, using its molar mass. Then, using Avogadro's number we can solve for the number of atoms:
<em>Moles FeCl₂ - Molar mass: 126.751g/mol-</em>
25g FeCl₂ * (1mol / 126.751g) = 0.1972 moles
<em>Number of atoms:</em>
1 mole of FeCl₂ are 6.022x10²³ molecules of FeCl₂, that means 0.1972moles are:
0.1972mol * (6.022x10²³ molecules / 1mol) = 1.188x10²³ molecules of FeCl₂
In 1 molecule of FeCl₂ there are 3 atoms (1 of Fe and 2 of Cl), in 1.188x10²³ molecules of FeCl₂ there are:
1.188x10²³ molecules of FeCl₂ * (3atoms / molecule) =
<h3>3.56x10²³ atoms</h3>
Answer:
There are 342 g/ 95. 2 g/m = 3.59 moles
Explanation:
MgCl2 → Molar mass is 95.2g g/m
This is the mass in one mol so to find out the moles in 342g we have to divide the mass between the molar mass.
342 g/ 95. 2 g/m = 3.59 moles