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Chemistry — KCSE 1995Paper 1
📚 Topic: Energy Changes in Chemical and Physical Processes
Question 16📚 Topic: Energy Changes in Chemical and Physical Processes
KCSE 1995 • CHEMISTRY PAPER 1 • QUESTION 16
Topic: Energy Changes in Chemical and Physical Processes
Sub-topic: Enthalpy of Combustion and Homologous Series
Sub-topic: Enthalpy of Combustion and Homologous Series
16. Study the table below and answer the questions that follow.
| Alkane | Formula | Heat of combustion \( (\Delta H_{c}) \text{ kJmol}^{-1} \) |
|---|---|---|
| Methane | \( CH_{4} \) | 890 |
| Ethane | \( C_{2}H_{6} \) | 1560 |
| Propane | \( C_{3}H_{8} \) | 2220 |
| Butane | \( C_{4}H_{10} \) |
a) Predict the heat of combustion of butane and write it on the space provided in the table above. (1mk)
b) What does the sign of \( \Delta H_{c} \) value indicate about combustion of alkanes? (1mk)
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