View the step-by-step solution to: 1) At constant pressure, the sign of q for the process

This question was answered on Apr 04, 2011. View the Answer
1) At constant pressure, the sign of q for the process H2O(l)->H2O(s) is expected to be:
a)negative, and the process is endothermic.
b)positive, and the process is exothermic.
c)positive, and the process is endothermic.
d)negative, and the process is exothermic.
e)impossible to predict.


2)Which of the following reactions corresponds to the thermochemical equation for the standard enthalpy of formation of N,N-diethyl-m-toluamide, C12H17NO(l), the active ingredient in some insect repellants?
a)12C(s) + 17H(g) + N(g) + O(g) -> C12H17NO(l)
b)12C(s) + 17/2 H2(g) + 1/2 N2(g) + 1/2 O2(g) ® C12H17NO(l)
c)12C(g) + 17H(g) + N(g) + O(g) -> C12H17NO(l)
d)12C(g) + 17H(g) + N(g) + O(g) -> C12H17NO(g)
e)12C(l) + 17H(l) + N(l) + O(l) -> C12H17NO(l)


3)H2 and F2 react according to the following equation, forming HF.
H2(g) + F2(g) -> 2HF(g); DH° = –271 kJ
If H2(g) and F2(g) were mixed in a thermally insulated vessel, the reaction that occurred would be:

a)exothermic, and the temperature of the reaction system would rise.
b)endothermic, and the temperature of the reaction system would rise.
c)endothermic, and the temperature of the reaction system would fall.
d)exothermic, and the temperature of the reaction system would fall.
e)We could not tell unless the original and final temperatures were given.
Sign up to view the entire interaction

PFA solution. [In case, if any... View the full answer

6959029.doc

1) At constant pressure, the sign of q for the process H2O(l)->H2O(s) is expected to be:
a)negative, and the process is endothermic.
b)positive, and the process is exothermic.
c)positive, and...

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors and customizable flashcards—available anywhere, anytime.

-

Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access or to earn money with our Marketplace.

    Browse Documents
  • 890,990,898

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
  • 890,990,898

    Flashcards

    Browse existing sets or create your own using our digital flashcard system. A simple yet effective studying tool to help you earn the grade that you want!

    Browse Flashcards