题目内容
已知3克乙烷在常温下完全燃烧放出的热量是155.98kJ，则下列乙烷燃烧热的热化学方程式书写正确的是（ ）
| A．2C2H6(g)+7O2(g)=4CO2(g)+6H2O(g)△H ="-2119.6" kJ/mol |
| B．C2H6(g)+5/2O2(g)=2CO2(g)+3H2O(g)△H ="-1559.8kJ/mol" |
| C．C2H6(g)+7/2O2(g)=2CO2(g)+3H2O(g)△H ="-1559.8" kJ/mol |
| D．C2H6(g)+7/2O2(g)=2CO2(g)+3H2O(l)△H ="-1559.8" kJ/mol |
D
解析
|
已知3克乙烷在常温下完全燃烧放出的热量是155.98 kJ，则下列乙烷燃烧热的热化学方程式书写正确的是 | |
| [ ] | |
A． |
2C2H6(g)＋7O2(g) |
B． |
C2H6(g)＋5/2O2(g) |
C． |
C2H6(g)＋7/2O2(g) |
D． |
C2H6(g)＋7/2O2(g) |
4CO2(g)＋6H2O(g) ΔH＝－2119.6 kJ/mol已知3克乙烷在常温下完全燃烧放出的热量是155.98kJ，则下列乙烷燃烧热的热化学方程式书写正确的是（ ）
|
A．2C2H6(g)+7O2(g)=4CO2(g)+6H2O(g)△H ="-2119.6" kJ/mol |
|
B．C2H6(g)+5/2O2(g)=2CO2(g)+3H2O(g)△H ="-1559.8kJ/mol" |
|
C．C2H6(g)+7/2O2(g)=2CO2(g)+3H2O(g)△H ="-1559.8" kJ/mol |
|
D．C2H6(g)+7/2O2(g)=2CO2(g)+3H2O(l)△H ="-1559.8" kJ/mol |
已知3克乙烷在常温下完全燃烧放出的热量是155.98kJ，则下列乙烷燃烧热的热化学方程式书写正确的是（ ）
| A．2C2H6(g)+7O2(g)=4CO2(g)+6H2O(g)△H ="-2119.6" kJ/mol |
| B．C2H6(g)+5/2O2(g)=2CO2(g)+3H2O(g)△H ="-1559.8kJ/mol" |
| C．C2H6(g)+7/2O2(g)=2CO2(g)+3H2O(g)△H ="-1559.8" kJ/mol |
| D．C2H6(g)+7/2O2(g)=2CO2(g)+3H2O(l)△H ="-1559.8" kJ/mol |