How to write the reaction between water and chromium metal under standard (i) acid and (ii) base condition?
Cr + 3H2O ----> Cr(OH)3 + 3e- + 3 H+ (acid condition)
basic solution ???
w= -P ΔV
in case of constant Pressure, ΔH= (q -PΔV) +PΔV >> ΔH= q
So w in ΔU will be the same when constant pressure with Δ(PV) in ΔH ?
if the pressure is not constant What is P in ΔU ? is it P external? and what is P in ΔH ? P in ΔH is Pressure of system? in case of ideal gas, Δ(PV) = nRT so...