Concept explainers
A gaseous mixture consists of 28.4 mole percent of hydrogen and 71.6 mole percent of methane. A 15.6-L gas sample, measured at 19.4°C and 2.23 atm, is burned in air. Calculate the heat released.
Interpretation:
The heat released has to be calculated.
Concept Introduction:
The change in enthalpy that is associated with the formation of one mole of a substance from its related elements being in standard state is called standard enthalpy of formation
(
The standard enthalpy of reaction is the enthalpy of reaction that takes place under standard conditions.
The equation for determining the standard enthalpies of compound and element can be given by,
Answer to Problem 6.85QP
The heat released is calculated as
Explanation of Solution
Given,
Mole percent of Hydrogen is
Mole percent of Methane is
Volume of the gas sample is
Temperature is
Pressure is
The reactions are written as,
The standard enthalpies of the reactions are calculated for both the equation,
For equation (1), the standard enthalpy of the reaction is,
For reaction (2), the standard enthalpy of the reaction is,
The total moles of gas in the mixture is calculated using the ideal gas equation
The heat released during the combustion is calculated as,
The heat released is calculated as
The heat released was calculated as
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