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A£®N2(g)+3H2(g)2NH3(g) £»¡÷H=¡ªQ1kJ¡¤mol¡ª1(Q1>0)
B£®2SO3(g)2SO2(g)+O2(g) £»¡÷H=+Q2kJ¡¤mol¡ª1(Q2>0)
C£®4NH3(g)+5O2(g)4NO(g)+6H2O(g)£»¡÷H=¡ªQ3kJ¡¤mol¡ª1(Q3>0)
D£®H2(g)+CO(g)C(s)+H2O(g)£» ¡÷H=+Q4kJ¡¤mol¡ª1(Q4>0)
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