2
QuizMultiple Choice
Thermochemical Equations
Question 2 of 10 • SS - TX - Chemistry B
Nitrogen reacts with hydrogen to form ammonia according to the equation below.Standard Enthalpies of FormationSubstanceDHf (kJ/mol)C2 H2 (g)–26.7NH3 (g)–46.19HBr (g)236.23HCl (g)–92.30HF (g)–268.6HI (g)25.9NaCl (s)–411.0Based on the equation and the information in the table, what is the enthalpy of the reaction?
Answer
A
Hrxn = 46.19 kJ
B
Hrxn = –46.19 kJ
C
Hrxn = 92.38 kJ
D
Hrxn = –92.38 kJ