What Are the Identities of Compounds Y and Z in This Boron Isolation Reaction?

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SUMMARY

In the discussion regarding the identities of compounds Y and Z in the boron isolation reaction, compound Y is identified as dichloromethane (CH2Cl2), a non-polar gas with terminal chlorine atoms. Compound Z is determined to be hydrogen chloride (HCl), which produces a highly acidic solution when bubbled through water. The balanced chemical equation for the reaction is 2 CH2Cl2 + 3 H2(g) → 2 B + 6 HCl. This reaction highlights the conversion of borax to pure boron through a series of chemical transformations.

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Chemistry: "Road map" question.

Borax can be converted to pure boron through the series of chemical reactions shown below:
Pure boron is isolated in the final step of this reaction series. The starting material Y, is a non-polar gas with terminal chlorine atoms. Compound Y (2 mol) is heated under constant H2(g) pressure (3 mol) to yield the final products, B (boron) (2 mol) and compound Z (6 mol). Compound Z is a gas that when bubbled through water will produce a highly acidic solution.

Balance the equation for the reaction Y and fill in the blanks for the equation below.

2 Y + 3 H2 (g) --> heat --> 2 B + 6 Z

What are Y and Z.
 
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It is up to you to find out.

There are several hints in the question. What chlorine containing gases that give acidic solutions when dissolved do you know?
 

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