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Ethylene on combustion gives carbon diox...

Ethylene on combustion gives carbon dioxide and water. Its heat of combustion is `1410.0 kJ mol^(-1)`. If the heat of formation of `CO_(2)` and `H_(2)O` are `393.3 kJ` and `286.2 kJ`, respectively. Calculate the heat of formation of ethylene.

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To calculate the heat of formation of ethylene (C₂H₄) from the given data, we can use Hess's law, which states that the total enthalpy change for a reaction is the sum of the enthalpy changes for the individual steps of the reaction. ### Step-by-Step Solution: 1. **Write the combustion reaction of ethylene:** The combustion of ethylene can be represented as: \[ \text{C}_2\text{H}_4(g) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 2\text{H}_2\text{O}(l) ...
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Enthylene on combustion gives carbon diocxide and water. Its enthalpy of combustion is 1410.0kJ // mol.If the enthalpy of formation of CO_(2) and H_(2)O are 393.3kJ and 286.2 kJ respectively, calculate the enthalpy of formation of ethylene.

The enthalpy of combustion of ethyl alcohol (C_(2)H_(5)OH) is 1380.7 kJ mol^(_1) . If the enthalpies of formation of CO_(2) and H_(2)O are 394.5 and 286.6kJ mol^(-1) respectively, calculate the enthalpy of formation of ethyl alcohol.

Knowledge Check

  • The heats of combustion for C, H_(2) and CH_(4) are -349, -241.8 and -906.7 kJ respectively. The heat of formation of CH_(4) is

    A
    174.1 kJ
    B
    274.1 kJ
    C
    374.1 kJ
    D
    74.1 kJ
  • Heat of formation of benzene, CO_(2(g)) and H_(2)O_((l)) are 45 kJ, -394 kJ and - 286 kJ respectively. Hence heat of combustion of benzene is

    A
    - 1885 kJ
    B
    `- 3177` kJ
    C
    - 3267 kJ
    D
    - 4080 kJ
  • The heats of combustion of C and CO are -393.5 and -283.5 kJ mol^(-1) respectively . The heat of formation (in kJ) of CO per mode is

    A
    `676.5`
    B
    `-676.5`
    C
    `-110.5`
    D
    `110.5`
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