Enthalpy of polymerisation of ethylene- as represented by the reaction- nCH2 - CH2 - -CH2 -CH2-n is -100 kJ per mole of ethylene- Given bond enthalpy of C - C bond is 600 kJ mol -1- Determine enthalpy of C C bond in kJ mol

The correct option is A 350 #160; nCH_2 = CH_2 → #160;( CH_2 CH_2 )n #160;Δ H= #160; 100 kJ mole^ #160; #160;bond enthalpy of C = C b ...

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Byju's Answer

Standard XII

Chemistry

Heat of Formation

Enthalpy of p...

Question

Enthalpy of polymerisation of ethylene, as represented by the reaction, $n C H_{2} = C H_{2} \to (- C H_{2} - C H_{2} -) n$ is -100 kJ per mole of ethylene. Given bond enthalpy of C = C bond is 600 kJ mol $^{- 1}$ , Determine enthalpy of C C bond (in kJ mol)

350

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323

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565

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453

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Solution

The correct option is A 350
$n C H_{2} = C H_{2} \to (- C H_{2} - C H_{2} -) n Δ H = - 100 k J m o l e^{-}$
bond enthalpy of $C = C$ bond is $600 k J m o l^{- 1}$ ,
Energy released = Energy due to formation of two single bonds
enthalpy of $C - C$ bond (in kJ mol) $= \frac{600 + 100}{2} = 350 K j / m o l e$

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Similar questions

Q. The polymerisation of ethylene to linear polyethylene is represented by the reaction

n C H_{2} = C H_{2} \to (- C H_{2} - C H_{2} -) n

where n has a large integral value. Given that average enthalpies of bond dissociation for

C = C

C - C

at 298 K are

+

590 &

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m o l^{- 1}

respectively. Then the enthalpy of polymerisation per mole of ethylene at 298 K is:

Q. The polymerization of ethylene to linear polyethylene is represented by the reaction,

n (C H_{2} == C H_{2}) ⟶ - - (- - C H_{2} - - C H_{2} - -) - -_{n}

where n has large integral value. Given that the average enthalpies of bond dissociation for

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and

C - - C

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are

+ 590

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respectively.

Calculate the enthalpy of polymerization per mole of ethylene at

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Polymerisation of ethene to poly - ethene is represented by the equation
$n (C H_{2} = C H_{2}) \to (- C H_{2} - C H_{2} -)_{n}$
Given that average enthalpies of C = C and C - C bonds at 298 K are 590 and 331 kJ $m o l^{- 1}$ respectively, predict the enthalpy change when 56g of ethene changes to polyethylene.