Chemistry Homework Help

24/7 Chemistry Homework Help

Get step-by-step solutions from expert tutors.

How it works?

Ask a question

Type, take a picture, or paste your question with all necessary details to ensure high-quality responses.

Get an answer in less than 24hrs

Once our tutors receive the question, they'll begin. You'll get an email once the solution is ready.

Get Notified

We will send you email and text notification to let you know when your question is answered.

Browse Homework Solutions

129 solutions

Enthalpy of Formation

Q. The tabulated molar heat of formation H f for tribromobenzene gas, C6H3B3(g), is the enthalpy of which reaction?

Solved • Apr 27, 2019

Enthalpy of Formation

Q. Use the following bond energies C—C 347 C=C 614 C—O 358 C=O 799 C—H 413 O—H 463 O—O 146 ∆rH for the reaction H2O2(g) + CH3OH(g) → H2CO(g + 2 H2O(g a. +345 kJ/mol-rxn b. -105 kJ/mol-rxn c. +199 kJ/m

Solved • Apr 26, 2019

Enthalpy of Formation

Q. Use standard enthalpies of formation to determine ΔHorxn for: 2NH3(g) + 3O2(g) + 2CH4(g) → 2HCN(g) + 6H2O(g) Enter in kJ.

Solved • Apr 25, 2019

Enthalpy of Formation

Q. Estimate the enthalpy change for the reaction CO(g) + 2 H2(g) --> H3C-O-H(g) (carbon monoxide reactant, methanol product) given the following bond energies:

Solved • Apr 23, 2019

Enthalpy of Formation

Q. Calculate the standard enthalpy change for the following reaction at 25°C. Mg(OH)2(s) + 2 HCl(g) → MgCl2(s) + 2 H2O(g)

Solved • Apr 22, 2019

Enthalpy of Formation

Q. Using bond-energy data, what is DH for the following reaction? CH3OH(g) + H2S(g) --> CH3SH(g) + H2O(g) Bond Bond Energy C-H 413 C-O 358 O-H 463 C-S 259 S-H 339

Solved • Apr 21, 2019

Enthalpy of Formation

Q. Determine the enthalpy change of Reaction 3: H2SO4 (l) → H2O(l) + SO3(g) using enthalpies of formation. Apply Hess's Law to determine enthalpy change for 2NaOH + SO3 → Na2SO4 + H2O(l).

Solved • Apr 18, 2019