Thursday
October 23, 2014

Homework Help: chemistry

Posted by marcus on Wednesday, November 14, 2012 at 9:24pm.

consider the following changes at constant temperature & pressure

H2O(s) --yields-- H20(l); Delta H1
H2O(l) --yields-- H2O(g); Delta H2
H2O(g) --yields-- H2O(s); Delta H3

Using Hess's law, the sum of the deltas is
a. equal to 0
b. sometimes greater than zero, sometimes less than zero
c. less than 0
d. cannot be determined without the numerical values of delta H
e. greater than 0

I picked e because delta 1 looks to be an endothermic reaction, delta 2 also endothermic, and delta 3 is exothermic reaction. But the answer is equal to 0. Why?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - Consider the following data: * NH3(g) yields 1/2 N2(g) + 3/2 H2(g) ...
Chemistry - Mg + 2HCl -> MgCl2 +H2 delta H = ? MgO + 2HCl (aq) -> MgCl2+ ...
Chemistry - Calculate the enthalpy of the reaction 2B2H6 + 6O2=2B2O3 +6H2O given...
Chem - RXN #1: H2 (g) + O2 (g) --> H2O2 (l) ; delta-H =? Calculate the ...
Chemistry - H2O (liquid) yields H2O gas delta H= +44kJ. How much heat is evolved...
Chemistry - Calculate the work involved if a reaction with an enthalpy change of...
Chemistry - I am having trouble with this equation and calculating the enthalpy ...
Chemistry - In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was ...
Chemistry - In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was ...
Chemistry! - Calculate the work involved if a reaction with an enthalpy change ...

Search
Members