Isotopes are atoms of the same element that have different masses. The relative atomic mass (am) is a weighted average that takes into account the abundance of each isotope. We can calculate the relative atomic mass using the following expression.
where,
- abi: percent abundance of each isotope
For Gallium,
[1]
where "x" and "y" are the unknown abundances.
We also know that the sum of both abundances must be 100%.
x + y = 100
y = 100 - x [2]
If we replace [2] in [1], we get
Then, in [2]
y = 100 - x = 100 - 20.5 = 79.5
In conclusion, Ga-69 has an abundance of 20.5% and Ga-71 has an abundance of 79.5%.
You can learn more about isotopes in: brainly.com/question/21536220?referrer=searchResults
Answer:
boron compound - known as Borax
Explanation:
Answer:
37.14 %
Explanation:
Using the equation, mass, M = D1 * V1
= D2 * V2
Where,
D1 = density of the liquid Nitrogen
D2 = density of gaseous Nitrogen
V1 = volume of the liquid Nitrogen
V2 = volume of the gaseous Nitrogen
Calculating V2,
0.808 * 185 = 1.15 * V2
Volume of Nitrogen after expansion = 129.98 m3.
Volume = L * b * h
= 10 * 10 * 3.5
Volume of the room = 350 m3.
Fraction of air = volume of Nitrogen after expansion/volume of the room * 100
= 129.98/350 *100
= 37.14 %
Answer:
The rate law of the reaction will be;
![R=k[H_3PO_4]^1](https://tex.z-dn.net/?f=R%3Dk%5BH_3PO_4%5D%5E1)
Explanation:
Let the rate law of the reaction be :![R=k[H_3PO_4]^a](https://tex.z-dn.net/?f=R%3Dk%5BH_3PO_4%5D%5Ea)
Where : R is rate of the reaction at at given concentration of 
and k is rate constant.
Rate of reaction from zero second to 1 second:
![0.012 M/s=k[0.018 M]^a](https://tex.z-dn.net/?f=0.012%20M%2Fs%3Dk%5B0.018%20M%5D%5Ea)
..[1]
Rate of reaction from 1 second to 2 second:
![0.007 M/s=k[0.011 M]^a](https://tex.z-dn.net/?f=0.007%20M%2Fs%3Dk%5B0.011%20M%5D%5Ea)
..[2]
[1] ÷ [2]
![\frac{0.012 M/s}{0.007M/s}=\frac{k[0.018 M]^a}{k[0.011 M]^a}](https://tex.z-dn.net/?f=%5Cfrac%7B0.012%20M%2Fs%7D%7B0.007M%2Fs%7D%3D%5Cfrac%7Bk%5B0.018%20M%5D%5Ea%7D%7Bk%5B0.011%20M%5D%5Ea%7D)
a = 1.09 ≈ 1
The rate law of the reaction will be;
Answer:
The meaning and usefulness of the mole Page 2 2 • One mole of NaCl contains 6.022 x 1023 NaCl formula units. Use the mole quantity to count formulas by weighing them. The mass of an atom in amu is numerically the same as the mass of one mole of atoms of the element in grams.
Explanation:
