Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

Enthalpy Calculation in Chemical Reactions

10 Questions

0 Views

Enthalpy Calculation in Chemical Reactions

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

In the formula H = (sum of enthalpies of products) – (sum of enthalpies of reactants), what do 'ai' and 'bi' represent?

Temperature and pressure values

Molar masses of products and reactants

Atomic numbers of reactants and products

Stoichiometric coefficients of products and reactants (correct)

Why is it important to specify standard conditions for calculating the standard enthalpy of a reaction?

To ensure all participating substances are in their standard states (correct)

To simplify the enthalpy change calculations

To account for variations in temperature

To eliminate the need for molar enthalpy calculations

What is the standard state of a substance at a specified temperature?

Dissolved in a solution

In a gaseous state

Combined with another compound

Pure form at 1 bar (correct)

How does knowledge of enthalpy change help in planning industrial chemical reactions?

By optimizing the reaction temperature Signup and view all the answers

What does the term 'molar enthalpy' refer to in the context of chemical reactions?

Enthalpy change per mole of a substance Signup and view all the answers

Which type of enthalpy change occurs when water melts?

Endothermic Signup and view all the answers

What is the standard enthalpy of vaporization for water?

40.79 kJ/mol Signup and view all the answers

Which process involves the direct conversion of a solid into its vapor phase?

Sublimation Signup and view all the answers

What is the enthalpy change associated with the sublimation of naphthalene?

-73.0 kJ/mol Signup and view all the answers

Which enthalpy change is positive by nature?

Standard enthalpy of vaporization Signup and view all the answers