1) Equilibrium reaction:

2) Equilibrium constant
![Ka= \frac{[H^+][HSO_3^-]}{[H_2SO_3]}](https://tex.z-dn.net/?f=Ka%3D%20%5Cfrac%7B%5BH%5E%2B%5D%5BHSO_3%5E-%5D%7D%7B%5BH_2SO_3%5D%7D%20)
The answer is the second option but it has a mistake because it is the ion HSO3 has oxidation state 1- and not 2-.
In a crystal of calcium chloride the chlorine atoms is two times more than calcium atoms.
Answer:

Explanation:
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In this case, considering the given chemical reaction and the mass of the magnesium strip, following the indications of the atomic weight ratio (2.61 g Cu/1 g Mg), and keeping in mind the 1:1 mole ratio one could compute the produced mass of copper as shown below:

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Each of the Isotopic mass * its Abundance Sum together divide by 100.
(179.946706*0.12 + 181.948206*26.5 + 182.9502245*14.3 + 183.9509326*30.64 + 185.954362*28.43 ) / 100
You get 183.84 (5s.f. ) or (183.8417786)
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Answer:
H₂Lv
Explanation:
Lv is at group 6 on the periodic table, so it has 6 valence electrons, likely oxygen. Thus, to be stable, it needs to gain 2 electrons. Hydrogen has 1 electron in its valence shell, so H₂ can share 2 electrons with Lv, and because of that, the product would be:
H₂Lv.