Topic content:
It is known that copper can be dissolved by concentrated HNO3 at room temperature, and the chemical equation of the reaction is Cu+4HNO3 steam Cu (NO3) 2+2NO2 ↑+2H2O
(1) Mark the electron transfer in the above reaction______
(2) If 1mol NO2 is generated in the reaction, the amount of HNO3 reduced is ______
Best answer:
(1) In Cu+4HN03 Cu (N03) 2+2NO2 ↑+2H20, the valence of Cu increases from 0 to+2, and the valence of N decreases from+5 to+4. If 2mol electrons are transferred in this reaction, the direction and number of electron transfers are.
So the answer is:
(2) It can be seen from the reaction that 1mol nitric acid will be reduced when 1mol gas is generated, so 1mol NO2 will be generated in the reaction, and the amount of HNO3 will be reduced to 1mol.
So the answer is:
1、mol.
Answer analysis:
There is no explanation for this question
Test core:
Essence of redox reaction: electron transfer (gain or loss or deviation) Characteristics of redox reaction: valence rise and fall (valence of some elements changes before and after reaction, which is the basis for judging redox reaction)