Enthalpy changes

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Questions (27)

Identify each enthalpy change by name and classify each change as exothermic or endothermic.a)1 mol C3H8 (l) ==> 1 mol C3H8 (g)
1. 5 answers
2. asked by Sal
3. 3,779 views
(1) MgCO3(s) ⟶ MgO(s) + CO2(g) ΔrH = 118.1 kJ mol−1(2) Mg(s) + 12O2(g) ⟶ MgO(s) ΔfH =−601.7 kJ mol−1 What is the
1. 5 answers
2. asked by jhope
3. 2,057 views
Each of the following processes is spontaneous as described. Which one will have ∆H approximately equal to zero?1.
1. 3 answers
2. asked by Mary
3. 701 views
Imagine you have been given a series of materials to react together and the following enthalpy change data has been recorded.
1. 1 answer
2. asked by Jack
3. 1,147 views
Using the table below that shows some values for standard enthalpy changes of combustion, calculate the standard enthalpy change
1. 2 answers
2. asked by ezile
3. 89 views
The table below shows some values for standard enthalpy changes of combustion.Substance incrementHc Ө / kJ mol−1 C(s) −394
1. 2 answers
2. asked by ezile
3. 92 views
CaCO3(s)  CaO(s) + CO2(g) ΔH = 177.8 kJUse your understanding of enthalpy changes to determine the relative stabilities of
1. 2 answers
2. asked by w
3. 79 views
How many grams of MgO are produced during an enthalpy change of -96.0 KJ if 2Mg(s) + O2(g) -> 2MgO(s) and delta H= -1204kj
1. 4 answers
2. asked by Carolyn
3. 2,127 views
A student dissolved 10.5 g of NH4Cl in 40 mL of water. The temperature of the water changed from 22.5oC to 5.1oC. Calculate the
1. 4 answers
2. asked by anaa
3. 921 views
Please explain.The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1
1. 3 answers
2. asked by Anonymous
3. 1,586 views
Enthalpy changes:H2O2(l) ----> H2O(l) + 1/2P2(g) delta H= -94.6kJ H2(g) + 1/2O2(g)----> H2O2 delta H= -286.0kJ Calculate the
1. 3 answers
2. asked by Megan
3. 2,932 views
consider the following changes at constant temperature & pressureH2O(s) --yields-- H20(l); Delta H1 H2O(l) --yields-- H2O(g);
1. 3 answers
2. asked by marcus
3. 1,950 views
Calculate the enthalpy change from P4 + 3O2 = P4O6
1. 2 answers
2. asked anonymously
3. 40 views
State whether the change in enthalpy is positive or negative for each of thefollowing steps in the formation of a solution:
1. 1 answer
2. asked anonymously
3. 84 views
Consider the following problem:Target: 2NOCl(g) ? N2(g)+ O2(g)+Cl2 (g) ?Hrxn= ? Steps: 1. 1/2 N2(g) + 1/2 O2(g)? NO(g) ?H= 90.3
1. 2 answers
2. asked by David
3. 525 views
I have the following marathon problem but am unsure where to start:A Sample consisting of 22.7g of nongaseous, unstable compound
1. 2 answers
2. asked by Derek
3. 567 views
Use standard heats of formation in Appendix L to calculate standard enthalpy changes for the following reactions.1.45 x 10-2 mol
1. 3 answers
2. asked by Kat
3. 957 views
I know I posted this question before, but can you clarify it??MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE
1. 2 answers
2. asked by Anonymous
3. 664 views
When you add 0.320 g of sodium metal to an excess of hydrochloric acid, you find that 3330 J of heat are produced. What is the
1. 2 answers
2. asked by Catherine
3. 665 views
I know I posted this question before, but can you clarify it??MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE
1. 2 answers
2. asked by Anonymous
3. 658 views
Please explain.The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1
1. 1 answer
2. asked by Anonymous
3. 668 views
Identify each enthalpy change by name and classify each change as exothermic or endothermic.a)1 mol C3H8 (l) ==> 1 mol C3H8 (g)
1. 1 answer
2. asked by Sal
3. 614 views
Post a New Question Current QuestionsHomework Help: Chemistry Posted by Anonymous on Thursday, November 14, 2013 at 8:45pm.
1. 2 answers
2. asked by Anonymous
3. 598 views
How many enthalpy changes (ÄH’s) would be required to calculate the total enthalpy change when ice at 0.0oC is turned to
1. 4 answers
2. asked by Anonymous
3. 520 views
Define a system and state the significant the enthalpy change for the system. Explain your reasoning?A) natural gas burning in a
1. 1 answer
2. asked by Saarah
3. 450 views
Question35. Exothermic enthalpy changes are indicated with (A) positive AH value (B) negative AH value (C) ± AH value (D) none
1. 1 answer
2. asked by Abdulrazak umar Usman
3. 13 views
c. Determine the value of the enthalpy change, AH xn, for the following reaction using the information below.→ 2 Al,03 (8) + 3
1. 1 answer
2. asked anonymously
3. 14 views