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Suppose a new metallic element X is discovered, and its reactions with oxygen gas and chlorine gas ...

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Suppose a new metallic element X is discovered, and its reactions with oxygen gas and chlorine gas ...

Suppose a new metallic element X is discovered, and its reactions with oxygen gas and chlorine gas at 298 K are studied.

Trial	Reaction	ΔHº_rxn (kJ/mol)
1	4X(s) + 3O₂(g) → 2X₂O₃(s)	–600
2	2X(s) + 3Cl₂(g) → 2XCl₃(s)	–800
3	4XCl₃(s) + 3O₂(g) → 2X₂O₃(s) + 6Cl₂(g)	–200

However, it is later discovered that one of the samples was contaminated, and the ΔHº_rxn value from this trial is not reliable. Which trial had the contaminated sample, and what should the correct value of ΔHº_rxn be for this trial?

▸ Trial 1 had the contaminated sample; its ΔHºrxn value should be –900 kJ/mol.

▸ Trial 2 had the contaminated sample; its ΔHºrxn value should be +100 kJ/mol.

▸ Trial 3 had the contaminated sample; its ΔHºrxn value should be –1000 kJ/mol.

▸ Trial 3 had the contaminated sample; its ΔHºrxn value should be +1000 kJ/mol.

▸ Not enough information is provided; all three trials must be redone.

Textbook

Chemistry: Atoms First

Edition: 4^th

Author: Burdge

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