For a thermochemical reaction: Cl2(g) + 1/2O2(g) ® Cl2O(g) DHorxn = 80.3 kJ, what is the value of DHorxn for the reaction 2Cl2O(g) ® 2Cl2(g) + O2(g)? ( )
A. -80.3 kJ
B. -160.6 kJ
C. 80.3 kJ
D. 160.6 kJ
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For a given reaction with DHorxnequal to 200 kJ, which statement is correct? ( )
A. The reaction is endothermic and the container of the reaction feels cool
B. The reaction is endothermic and the container of the reaction feels warm
C. The reaction is exothermic and the container of the reaction feels cool
D. The reaction is exothermic and the container of the reaction feels warm
The DHorxn for which reaction is a standard enthalpy of formation? ( )
A. SnCl4(l) ® SnCl2(s) + Cl2(g)
B. SnCl2(l) ® Sn(s) + Cl2(g)
C. 2Cl2(g) + O2(g) ® 2Cl2O(g)
D. Cl2(g) + H2O(l) ® HCl(aq) + HOCl(aq)
Which one has similar properties to phosphorus ( )?
A. silicon (Si)
B. carbon (C)
C. oxygen (O)
D. arsenic (As)
Air within a container is ( )
A. heterogeneous mixture
B. homogeneous mixture
C. an element
D. a compound
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