Which is a substitute in this redox reaction is the oxidizing agent?
cu + 2agno3 -> 2ag + cu(no3)2

Cu is the oxidising agent dear

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.