Which of the following is the closest to the observed abundance of 71Ga, one of two stable gallium isotopes (69Ga and 71Ga). The
1 answer:
You must see the mass of Gallium in the periodic table. The mass present there is calculated by a weighted average of the mass of the isotopes, where the weights are the abundances of each isotope. Let X the isotopic abundance of Ga⁷¹. Since there are only Ga⁶⁹ and Ga⁷¹, the isotopic abundance of Ga⁶⁹ is 1-X. Then:
I don't know the options, but probably 40% is the closest to 36.15%.
I don't know the options, but probably 40% is the closest to 36.15%.
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These are three questions.
Answer:
- Question 1) Find Kc at 25°C: 617
- Question 2) Find [H₂] at 340°C: <u>0.352 M </u>
- Question 3) Find [HI] at 445°C: <u>0.342 M</u>
Explanation:
I will start by copying the table for better understanding of the data and the work to do.
T(∘C) [H2] [I2] [HI] [Kc]
25 0.0355 0.0388 0.922 -
340 4.60×10⁻²M 0.394M 9.6
445 4.90×10−2M 4.76×10⁻²M − 50.2
The chemical equation that represents the equilibrium is also given:
- H₂ (g) + I₂(g) ⇄ 2HI(g)
From that equilibrium equation, you can fnd the expression of the equlibrium constant, Kc, as:
The calculations and explanations to answer the three questions are in the pdf file attached.
Please, click on the image of the file to open it.