A) \[1,900\]
B) \[~-788.9\times {{10}^{3}}\]
C) \[1,90,000\]
D) \[~+\,788.9\times \,{{10}^{3}}\]
Correct Answer: A
Solution :
\[C(\text{graphite})\,+{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g);\] \[\Delta H=-393.5\,kJ\] ?(i) \[\text{C}\,\text{(diamond)}\,\text{+}\,O{{}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g);\] \[\Delta H=-395.4\,kJ\] ?(ii) C (graphite)\[\xrightarrow{{}}\]C(diamond); Subtract the Eq (ii) form (i) C (graphite) \[\xrightarrow{{}}\]C(diamond) \[\Delta H=-393.5-(-395.4)\] \[=1.9\,kJ=1900\,J\]You need to login to perform this action.
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