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)→X₂O₃(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? A)Trial 1 had the contaminated sample; its ΔHº_rxn value should be -900 kJ/mol. B)Trial 2 had the contaminated sample; its ΔHº_rxn value should be +100 kJ/mol. C)Trial 3 had the contaminated sample; its ΔHº_rxn value should be -1000 kJ/mol. D)Trial 3 had the contaminated sample; its ΔHº_rxn value should be +1000 kJ/mol. E)Not enough information is provided; all three trials must be redone.

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The Answer of 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)→X₂O₃(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? A)Trial 1 had the contaminated sample; its ΔHº_rxn value should be -900 kJ/mol. B)Trial 2 had the contaminated sample; its ΔHº_rxn value should be +100 kJ/mol. C)Trial 3 had the contaminated sample; its ΔHº_rxn value should be -1000 kJ/mol. D)Trial 3 had the contaminated sample; its ΔHº_rxn value should be +1000 kJ/mol. E)Not enough information is provided; all three trials must be redone.

Suppose a New Metallic Element X Is Discovered,and Its Reactions