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Chemistry — KCSE 1995Paper 1
📚 Topic: Thermochemistry
Question 16📚 Topic: Thermochemistry
KCSE 1995 PAPER 1 CHEMISTRY QUESTION 16
Topic: Energy Changes in Chemical and Physical Processes
Sub-topic: Enthalpy of Combustion / Homologous Series Trends
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 | \( C_2H_6 \) | 1560 |
| Propane | \( C_3H_8 \) | 2220 |
| Butane | \( C_4H_{10} \) |
a) Predict the heat of combustion of butane and write it on the space provided in the table above? (1 mk)
b) What does the sign of \( \Delta H_c \) value indicate about combustion of alkanes? (1 mk)
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