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Which is true for the combustion of sucr...

Which is true for the combustion of sucrose `(C_(12)H_(22)O_(11))` at `25^(@)C` :-

A

`Delta H gt Delta E`

B

`Delta H lt Delta E`

C

`Delta H = Delta E`

D

None

Text Solution

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The correct Answer is:
To determine which statement is true for the combustion of sucrose (C₁₂H₂₂O₁₁) at 25°C, we can analyze the combustion reaction and apply the first law of thermodynamics. ### Step-by-Step Solution: 1. **Write the Combustion Reaction**: The balanced chemical equation for the combustion of sucrose is: \[ C_{12}H_{22}O_{11} (s) + 12 O_{2} (g) \rightarrow 12 CO_{2} (g) + 11 H_{2}O (l) \] 2. **Identify the States of Matter**: - Sucrose is in solid form (s). - Oxygen is in gaseous form (g). - Carbon dioxide is in gaseous form (g). - Water is in liquid form (l). 3. **Calculate the Change in Moles of Gas (\(\Delta N_G\))**: \[ \Delta N_G = \text{(moles of gaseous products)} - \text{(moles of gaseous reactants)} \] - Moles of gaseous products = 12 (from 12 CO₂) - Moles of gaseous reactants = 12 (from 12 O₂) \[ \Delta N_G = 12 - 12 = 0 \] 4. **Apply the First Law of Thermodynamics**: According to the first law of thermodynamics, the change in enthalpy (\(\Delta H\)) is related to the change in internal energy (\(\Delta E\)) by the equation: \[ \Delta H = \Delta E + \Delta N_G RT \] Since \(\Delta N_G = 0\), the equation simplifies to: \[ \Delta H = \Delta E \] 5. **Conclusion**: From the above analysis, we conclude that for the combustion of sucrose at 25°C, the change in enthalpy (\(\Delta H\)) is equal to the change in internal energy (\(\Delta E\)). Therefore, the correct statement is that \(\Delta H = \Delta E\). ### Final Answer: The correct option is **C**: \(\Delta H = \Delta E\).

To determine which statement is true for the combustion of sucrose (C₁₂H₂₂O₁₁) at 25°C, we can analyze the combustion reaction and apply the first law of thermodynamics. ### Step-by-Step Solution: 1. **Write the Combustion Reaction**: The balanced chemical equation for the combustion of sucrose is: \[ C_{12}H_{22}O_{11} (s) + 12 O_{2} (g) \rightarrow 12 CO_{2} (g) + 11 H_{2}O (l) ...
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ALLEN-THERMODYNAMICS -EXERCISE -2
  1. For the system S (s) + O(2)(g) rarr SO(2)(g) ?

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  2. For the reaction CO(g)+(1)/(2)O(2)(g)rarr CO(2)(g) Which one of the ...

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  3. Which is true for the combustion of sucrose (C(12)H(22)O(11)) at 25^(@...

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  4. Identify the reaction for which Delta H != Delta E

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  5. The heat of combustion of ethanol determined in a bomb calorimeter is ...

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  6. The difference in Delta H and Delta E for the combustion of methane at...

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  7. Which of the following reactions is Delta H less than Delta E ?

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  8. For a reaction 2X(s)+2Y(s)rarr 2Cl(l)+D(g) The q(p) at 27^(@)C is -...

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  9. The work done in ergs for the reversible expansion of one mole of an i...

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  10. Two liters of N(2) at 0^(@)C and 5 atm pressure is expanded isothermal...

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  11. Two moles of an ideal gas expand spontaneously into a vacuum. The work...

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  12. One mole of a gas occupying 3dm^(3) expands against a constant externa...

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  13. For which reaction from the following, DeltaS will be maximum?

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  14. An adiabatic process is one in which :-

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  15. Entropy means

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  16. Delta S for the reaction : MgCO(3) rightarrow MgO(s) + CO(2)(g)

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  17. Change in entropy is negative for

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  18. In which reaction Delta S is positive :-

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  19. When the egg is hard boiled, there

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  20. If S^@" for "H(2), Cl2 and HCl are 0.13, 0.22 and 0.19" kJ K"^(-1)"mol...

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