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Write a balanced chemical equation for the complete combustion of 1-butanol - HSC - SSCE Chemistry - Question 23 - 2010 - Paper 1
Question 23
Write a balanced chemical equation for the complete combustion of 1-butanol. The published value for the heat of combustion of 1-butanol is 2676 kJ mol⁻¹. Which fue... show full transcript
Worked Solution & Example Answer:Write a balanced chemical equation for the complete combustion of 1-butanol - HSC - SSCE Chemistry - Question 23 - 2010 - Paper 1
Step 1
Write a balanced chemical equation for the complete combustion of 1-butanol.
Answer
The balanced chemical equation for the complete combustion of 1-butanol (C₄H₉OH) is as follows:
ightarrow 4 ext{CO}_2 + 5 ext{H}_2 ext{O}$$ In this reaction, 1-butanol reacts with oxygen to produce carbon dioxide and water.Step 2
Which fuel from the table is likely to be 1-butanol? Justify your answer.
Answer
To determine which fuel is likely to be 1-butanol, we can compare the heat of combustion values. The published value for 1-butanol is 2676 kJ mol⁻¹. Looking at the table:
- Fuel A: -48 kJ g⁻¹
- Fuel B: -38 kJ g⁻¹
- Fuel C: -28 kJ g⁻¹
Since heat of combustion is usually given in kJ mol⁻¹, we need to convert these values (assuming the molecular weights are similar for small organic fuels). Fuel A, B, and C have negative values, suggesting they are less exothermically favorable compared to 1-butanol, which has a significantly higher and positive calorific value. Therefore, none of these fuels seem to match 1-butanol, but based on the trend, Fuel A could potentially represent the closest match considering its larger negative value, meaning less energy is released during combustion compared to 1-butanol.