题目内容

Consider the reaction between NO and Cl2 to form NOCl: 2NO (g) + Cl2 (g) ® 2NOCl (g)A reaction mixture at a certain temperature initially contains only [NO] = 0.50 M and [Cl2] = 0.50 M. After the reaction comes to equilibrium, the concentration of NOCl is 0.30 M. Find the value of the equilibrium constant (Kc ) at this temperature. ( )

A. 11
B. 4.3
C. 6.4
D. 0.22

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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

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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)

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Which one has similar properties to phosphorus ( )?

A. silicon (Si)
B. carbon (C)
C. oxygen (O)
D. arsenic (As)

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A. 11 B. 4.3 C. 6.4 D. 0.22

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)? ( )

For a given reaction with DHorxnequal to 200 kJ, which statement is correct? ( )

The DHorxn for which reaction is a standard enthalpy of formation? ( )

Which one has similar properties to phosphorus ( )?

A. 11
B. 4.3
C. 6.4
D. 0.22