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In this lesson, we will learn how to calculate reaction enthalpies by comparing the standard enthalpies of formation of the reactants and the products.
Q1:
How does the standard enthalpy of formation of H O ( ) 2 g differ from Ξ π» ⦡ m for the reaction 2 H ( ) + O ( ) 2 H O ( ) 2 2 2 g g g expressed per mole of oxygen reacted?
Q2:
Using the data in the table, calculate to the nearest kJ/mol the standard enthalpy of combustion of hydrazine ( N H ) 2 4 . One of the products of the reaction is nitrogen.
Q3:
In the early days of automobiles, illumination at night was provided by burning acetylene, C H 2 2 . Though no longer used in headlamps, acetylene is still used as a source of light by some cave explorers. Acetylene can be prepared by the reaction of water with calcium carbide, C a C 2 : What is the standard enthalpy of the reaction?
Q4:
Using the data in the table, calculate to the nearest kJ/mol the standard enthalpy of combustion of methane.
Q5:
Using the data below, calculate to 3 significant figures the standard molar enthalpy of combustion of diborane ( B H ) 2 6 .
Q6:
The white pigment T i O 2 is prepared by the reaction of titanium tetrachloride, T i C l 4 , with water vapor in the gas phase: How much heat is evolved in the production of exactly 1 mole of T i O 2 ( π ) under standard state conditions?
Q7:
Among the substances that react with oxygen and that have been considered as potential rocket fuels are diborane ( B H ( ) 2 6 g , produces B O ( ) 2 3 s and H O ( ) 2 g ), methane ( C H ( ) 4 g , produces C O ( ) 2 g and H O ( ) 2 g ), and hydrazine ( N H ( ) 2 4 l , produces N ( ) 2 g and H O ( ) 2 g ). On the basis of the heat released by 1.00 g of each substance in its reaction with oxygen, which of these compounds offers the best possibility as a rocket fuel?
Q8:
Ethylene, C H 2 2 , a byproduct from the fractional distillation of petroleum, is fourth among the 50 chemical compounds produced commercially in the largest quantities. About 8 0 % of synthetic ethanol is manufactured from ethylene by its reaction with water in the presence of a suitable catalyst: Using the data below, what is Ξ π» ⦡ for the reaction?
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