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Given: 2C((s)) + 2O(2(g)) to 2CO(2(g))...

Given:
`2C_((s)) + 2O_(2(g)) to 2CO_(2(g)),
Delta H_1 =-767 kJ …(i)
H_(2(g)) + 1/2 O_(2(g)) to H_2 O_((l)),
Delta H_2 =-266 kJ …(ii)
C_2 H_(2(g)) + 5/2 O_2 to 2CO_(2(g)) + H_2 O_((l))`,
`Delta H_3 =-1290 kJ` ….(iii)
Heat of formation of acetylene is _________ .

A

1802 kJ

B

`-1802`kJ

C

257 kJ

D

237 kJ

Text Solution

Verified by Experts

The correct Answer is:
C
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TARGET PUBLICATION-CHEMICAL THERMODYNAMICS AND ENERGETICS -CRITICAL THINKING
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  14. For reaction 2Cl((s)) to Cl(2(s)), the signs of Delta H "and " Delta S...

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  15. The Delta S for the vaporization of 1 mol of water is 88.3 J/mol K. Th...

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  16. For the change H2 O((l)) to H2 O((g)) , P=1 atm, T=373 K, the free ene...

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