Question:
The enthalpy of combustion of methane is 890 kJ/mol. How much heat is released when 8 g of methane is burned completely? (Molar mass of CH\(_4\) = 16 g/mol)
The enthalpy of combustion of methane is 890 kJ/mol. How much heat is released when 8 g of methane is burned completely? (Molar mass of CH\(_4\) = 16 g/mol)
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To calculate the heat released during combustion, multiply the enthalpy of combustion by the number of moles of the substance burned.
Updated On: May 21, 2025
- 445 kJ
- 222.5 kJ
- 890 kJ
- 1780 kJ
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The Correct Option is A
Solution and Explanation
The number of moles of methane (\(n\)) in 8 g is:
\[
n = \frac{\text{Mass}}{\text{Molar mass}} = \frac{8}{16} = 0.5 \, \text{mol}
\]
The enthalpy of combustion of methane is 890 kJ/mol. Therefore, the heat released when 0.5 moles of methane is burned is:
\[
\text{Heat released} = 0.5 \times 890 = 445 \, \text{kJ}
\]
Final answer
Answer: \(\boxed{445\, \text{kJ}}\)
Final answer
Answer: \(\boxed{445\, \text{kJ}}\)
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