Answer:
Abundance of Ga 70.925 is 0.399 and percentage abundance of Ga 39.9%
Abundance of Ga 68.926 is 0.601 and percentage abundance is 60.1 %.
Explanation:
we know there are two naturally occurring isotopes of gallium Ga 68.926 and Ga 70.925.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 70.925
1-x for isotopes having mass 68.926
The average atomic mass of Ga is 69.72.
we will use the following equation,
70.925 x + 68.926 (1-x) = 69.72
70.925 x + 68.926 - 68.926x = 69.72
70.925x- 68.926x = 69.72 - 68.926
1.99 x = 0.794
x= 0.794/ 1.99
x= 0.399
abundance of Ga 70.925 is 0.399, because we solve the fraction x.
0.399 × 100 = 39.9 %
39.9 % is percentage abundance of Ga 70.925
now we will calculate the abundance of Ga 68.926.
(1-x)
1 - 0.399 = 0.601
abundance of Ga 68.926 is 0.601 and percentage abundance is
0.601 × 100= 60.1 %
I think the correct answer from the choices listed above is the first option. Burning biomass releases fewer toxins than coal. When coal is burned, it releases<span> many </span>toxic<span> gases and pollutants into the atmosphere which is not favorable to the people and for the environment. Hope this answers the question.</span>
Answer:
False
Explanation:
A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.
Answer:
(3) 345 nm
Explanation:
<u>Given:</u>
Average C-C bond energy = 347 kJ/mol
<u>To determine:</u>
Wavelength of photon that can break a C-C bond
<u>Calculation:</u>
The energy (E) of a photon is related to its wavelength (λ) by the Planck's equation:
where h = Planck's constant = 6.626*10⁻³⁴ Js
c = speed of light = 3*10⁸ m/s
λ = 3.45*10⁻⁷ m
Since 1 nanometer (nm) = 10⁻⁹ m
The calculated wavelength corresponds to 345 nm
