ΔcHm?(石墨)=-393.7kJ/mol,ΔcHm?(金刚石)=-395.8kJ/mol,则反应C(石墨)=C(金刚石)的焓变应为()

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ΔcHm?(石墨)=-393.7kJ/mol,ΔcHm?(金刚石)=-395.8kJ/mol,则反应C(石墨)=C(金刚石)的焓变应为()

A.-789.5kJ/mol

B.-2.1kJ/mol

C.+2.1kJ/mol

D.+789.5kJ/mol

参考答案:

答案:C