What is the change in enthalpy for this reaction? 2C =O + O=O rightarrow 2O=C=O

Question

What is the change in enthalpy for this reaction? 2C =O + O=O rightarrow 2O=C=O (A) -1039 kJ (B) -561 kJ (C) 561 kJ (D) 1039 kJ Using the information below, what is Delta H degree for the reaction: 2C_2H_2(g) + 5O_2(g) rightarrow 4CO_2(g) + 2H_2O(l)? 4C(s) + 2H_2(g) rightarrow 2C_2H_ 2(g) Delta H degree = +226.7 kJ C(s) + O_2(g) rightarrow CO_2(g) Delta H degree = -393.5 kJ 2H_2(g) + O_2(g) rightarrow 2H_2O(l) Delta H degree = - 571.6 kJ (A) -2372 kJ (B) -1919 kJ (C) -1192 kJ (D) -738.4 kJ What is Delta H degree for this reaction? 4NH_3(g) + 3O_2(g) rightarrow 2N_2(g) + 6H_2O(l) (A) -1900 kJ (B) -1530 kJ (C) -332.0 kJ (D) -239.6 kJ The density of water at 25 degree C is 0.9584 g middot mL^-1. A student performed three trial measurements to determine the density of water at 25 degree C and obtained the results shown. Which term(s) best describe these measurements? (A) accurate (B) precise (C) both precise and accurate (D) neither precise nor accurate

Explanation / Answer

Q67

HRxn = Hproducts - Hrectants

HRxn = 4*( C=O ) - (2*C(triple)O + O=O)

substitute daata

HRxn = 4*( 800 ) - (2*1070+ 499)

HRxn= 561 kJ

best answer is C

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