If two shells overlap, they start to share electrons and thus, a bond is formed
The mass of HCl that is contained in the solution is 147 g HCl
Why?
To find the mass of HCl we have to apply what is called a conversion factor. In a conversion factor we put the units we don't want at the bottom, and the ones we want at the top.
For this question, we want to go from liters of solution to mass of HCl, and the conversion factor is laid out as follows:

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the answer is B. Atmosphere
Answer: 1, magnesium & mg
2, two energy shells
Explanation: