已知:2Zn(s)+O2(g)=2ZnO(s)△H1=-702.2kJ/mol &nb
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已知:
2Zn(s)+O2(g)=2ZnO(s)△H1=-702.2kJ/mol
2Hg(s)+O2(g)=2Hg O(s)△H2=-181.4kJ/mol
Zn(s)+HgO(s)=Hg(s)+ZnO(s)△H3
则△H3的值是( )
A.-441.8kJ/mol
B.-254.6kJ/mol
C.-438.9kJ/mol
D.-260.4kJ/mol
2Zn(s)+O2(g)=2ZnO(s)△H1=-702.2kJ/mol
2Hg(s)+O2(g)=2Hg O(s)△H2=-181.4kJ/mol
Zn(s)+HgO(s)=Hg(s)+ZnO(s)△H3
则△H3的值是( )
A.-441.8kJ/mol
B.-254.6kJ/mol
C.-438.9kJ/mol
D.-260.4kJ/mol
由①2Zn(s)+O2(g)=2ZnO(s)△H1=-702.2kJ/mol,
②2Hg(s)+O2(g)=2Hg O(s)△H2=-181.4kJ/mol,
根据盖斯定律可知,
①−②
2得到Zn(s)+HgO(s)=Hg(s)+ZnO(s),
则△H3=
−702.2kJ/mol−(−181.4kJ/mol)
2=-260.4kJ/mol,
故选D.
②2Hg(s)+O2(g)=2Hg O(s)△H2=-181.4kJ/mol,
根据盖斯定律可知,
①−②
2得到Zn(s)+HgO(s)=Hg(s)+ZnO(s),
则△H3=
−702.2kJ/mol−(−181.4kJ/mol)
2=-260.4kJ/mol,
故选D.
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