Interpretation: The amount of heat liberated when 4.80 g of methane reacts with an excess of oxygen needs to be determined.
Concept Introduction: The relation between number of moles, mass and molar mass is as follows:
Here, m is mass, M is molar mass and n is number of moles.
Explanation of Solution
The combustion of methane is represented follows:
The change in enthalpy of reaction is -890 kJ. Since the change in enthalpy is negative, the reaction is exothermic in nature.
In the above reaction, number of moles of methane is 1 mol. Thus, for 1 mol -890 kJ of heat is liberated.
The given amount of methane is 4.80 g in the excess of oxygen.
The molar mass of methane is 16.04 g/mol thus, number of moles can be calculated as follows:
Here, m is mass and M is molar mass.
Substitute the values,
For 1 mol of methane, the amount of heat liberated is -890 kJ thus, for 0.299 mol, the amount of heat liberated will be:
Thus, the amount of heat liberated is
Chapter 21 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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