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