An Equation Representing the Combustion of Ethane in a Closed System
2 C2H6 (9) + 7 02(9) → 4 CO2(g) + 6 H20(1)
2. The enthalpy change for the reaction represented by the equation above is
KJ.
X
-2856.8
-3120.8
-168.0
-1560.4

To determine the enthalpy change for the combustion of ethane, we first need to understand the reaction and the given enthalpy change options.

The balanced equation for the combustion of ethane is:
\[ 2 \text{C}_2\text{H}_6 (g) + 7 \text{O}_2 (g) \rightarrow 4 \text{CO}_2 (g) + 6 \text{H}_2\text{O} (l) \]

In this balanced chemical equation:
- \( 2 \text{C}_2\text{H}_6 \) represents ethane.
- \( 7 \text{O}_2 \) represents oxygen.
- \( 4 \text{CO}_2 \) represents carbon dioxide.
- \( 6 \text{H}_2\text{O} \) represents water.

We are given four possible values for the enthalpy change (\( \Delta H \)) of the reaction:
1. -2856.8 kJ
2. -3120.8 kJ
3. -168.0 kJ
4. -1560.4 kJ

The combustion of hydrocarbons is typically an exothermic process, meaning that the enthalpy change will be negative.

Given that the reaction involves the combustion of ethane, we can reason that the enthalpy change would be significant. By examining the given options, the value that fits the description of an exothermic reaction with the magnitude expected for the combustion of ethane is -3120.8 kJ.

Thus, the enthalpy change for the reaction represented by the equation above is:

\[ \Delta H = -3120.8 \, \text{kJ} \]

Would you like further details or have any questions?

Here are 5 questions you might want to ask:
1. How do you calculate the enthalpy change of a reaction using bond energies?
2. Can you explain the process of balancing a chemical equation?
3. What is the difference between endothermic and exothermic reactions?
4. How does the law of conservation of mass apply to chemical reactions?
5. What are some common methods for measuring enthalpy changes in reactions?

**Tip:** When solving chemical equations, always ensure the equation is balanced before performing any calculations related to stoichiometry or thermodynamics.

Understand how to calculate the enthalpy change for the combustion of ethane with a detailed explanation and step-by-step solution. Learn about stoichiometry and thermodynamics in chemistry. Suitable for advanced chemistry students.

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