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(Note That Some of These Are the Same Problems as Found

Question 24

Multiple Choice

(Note that some of these are the same problems as found in the section headed Enthalpies of Atom Combination. However in this section all problems are worked using Enthalpies of Formation.)
-What is the sign of the enthalpy of reaction for the reaction P4O6(s) + 2 O2(g) + 6 H2O(g) →\rightarrow 4 H3PO4(s)
Assuming that all compounds are present in their most stable state at 25°C and 1 atm pressure?
(Note that some of these are the same problems as found in the section headed Enthalpies of Atom Combination. However in this section all problems are worked using Enthalpies of Formation.) -What is the sign of the enthalpy of reaction for the reaction P<sub>4</sub>O<sub>6</sub>(s) + 2 O<sub>2</sub>(g) + 6 H<sub>2</sub>O(g) \rightarrow 4 H<sub>3</sub>PO<sub>4</sub>(s) Assuming that all compounds are present in their most stable state at 25°C and 1 atm pressure? A) positive B) negative C) impossible to determine from the data


A) positive
B) negative
C) impossible to determine from the data

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