10 Questions
In the formula H = (sum of enthalpies of products) – (sum of enthalpies of reactants), what do 'ai' and 'bi' represent?
Stoichiometric coefficients of products and reactants
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
What is the standard state of a substance at a specified temperature?
Pure form at 1 bar
How does knowledge of enthalpy change help in planning industrial chemical reactions?
By optimizing the reaction temperature
What does the term 'molar enthalpy' refer to in the context of chemical reactions?
Enthalpy change per mole of a substance
Which type of enthalpy change occurs when water melts?
Endothermic
What is the standard enthalpy of vaporization for water?
40.79 kJ/mol
Which process involves the direct conversion of a solid into its vapor phase?
Sublimation
What is the enthalpy change associated with the sublimation of naphthalene?
-73.0 kJ/mol
Which enthalpy change is positive by nature?
Standard enthalpy of vaporization
Learn how to calculate the change in enthalpy for chemical reactions using the enthalpy of products and reactants. Understand the formula involving stoichiometric coefficients and molar enthalpies.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
