已知101KPa时的辛烷的燃烧热为5518kJ/mol.强酸与强碱在稀溶液中发生反应时的中和热为57.3kJ/mol.则下列热化学方程式书写正确的是( ) ①C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l), △H = +5518kJ/mol ②C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l), △H = -5518kJ/mol ③H+(aq)+ OH-(aq)= H2O(l), △H = -57.3kJ/mol ④1/2H2SO4 =1/2Na2SO4(aq) + H2O(l), △H = +57.3kJ/mol A.①③ B.②③ C.②④ D.①④ 查看更多

 

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已知101KPa时的辛烷的燃烧热为5518kJ/mol,强酸与强碱在稀溶液中发生反应时的中和热为57.3kJ/mol,则下列热化学方程式书写正确的是
①H+(aq)+OH-(aq)=H2O(l)△H=-57.3kJ/mol
1
2
H2SO4(aq)+NaOH(aq)=
1
2
Na2SO4(aq)+H2O(l)△H=+57.3kJ/mol
③C8H18(l)+
25
2
O2(g)=8CO2(g)+9H2O(l)△H=+5518kJ/mol
④C8H18(l)+
25
2
O2(g)=8CO2(g)+9H2O(l)△H=-5518kJ/mol(  )

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已知101KPa时的辛烷的燃烧热为5518kJ/mol,强酸与强碱在稀溶液中发生反应时的中和热为57.3kJ/mol,则下列热化学方程式书写正确的是
[     ]
①C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l); △H = +5518kJ/mol
②C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l); △H = -5518kJ/mol
③H+(aq)+ OH-(aq)= H2O(l); △H = -57.3kJ/mol
④1/2H2SO4(aq) + NaOH(aq) =1/2Na2SO4(aq) + H2O(l); △H = +57.3kJ/mol
A.①③
B.②③
C.②④
D.②

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已知101KPa时的辛烷的燃烧热为-5518kJ/mol,强酸与强碱在稀溶液中发生反应时的中和热为-57.3kJ/mol,则下列热化学方程式书写正确的是                           (   )

①C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l);  △H = +5518kJ/mol

②C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l);  △H = -5518kJ/mol

③H+(aq)+ OH(aq)= H2O(l);  △H = -57.3kJ/mol

④1/2H2SO4(aq) + NaOH(aq) =1/2Na2SO4(aq) + H2O(l);  △H = +57.3kJ/mol

A.①③            B.②③         C.②④             D.②

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已知101KPa时的辛烷的燃烧热为-5518kJ/mol,强酸与强碱在稀溶液中发生反应时的中和热为-57.3kJ/mol,则下列热化学方程式书写正确的是(    )

①C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l);  △H = +5518kJ/mol

②C8H18(l)+ 25/2O2(g)= 8CO2(g)+ 9H2O(l);  △H = -5518kJ/mol

③H+(aq)+ OH(aq)= H2O(l);  △H = -57.3kJ/mol

④1/2H2SO4(aq) + NaOH(aq) =1/2Na2SO4(aq) + H2O(l);  △H = +57.3kJ/mol

A.①③            B.②③         C.②④             D.②

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已知:101kPa时,辛烷的燃烧热为5518kJ·mol-1,强酸与强碱在稀溶液中发生反应时的中和热为57.3kJ·mol-1,则下列热化学方程式书写正确的是                                  (    )

     ① C8H18(l)+O2(g)= 8CO2(g)+9H2O(g);△H = -5518kJ·mol-1

     ② C8H18(l)+O2(g)= 8CO2(g)+9H2O(l);△H = -5518kJ·mol-1

     ③ H+ OH= H2O;△H = -57.3kJ·mol-1

     ④ NaOH(aq)+H2SO4(aq) Na2SO4(aq)+H2O(l);△H= +57.3kJ·mol-1

     A.①③          B.②             C.②④           D.②③

 

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