10 For which one of the reactions, ΔH is NOT equal to ΔU a) H2(g) + I2(g) - Chemistry - Solutions

Question

10 For which one of the reactions, ΔH is NOT equal to
ΔU? a) H2(g) + I2(g)  2HI(g) b) N2(g) + 3H2(g)
 2NH3(g) c) C(s) + O2(g)  CO2(g) d) HCl(aq) +
NaOH(aq)  H2O(l)

Goutam Pradhan · Accepted Answer

Solution:We know: ∆H=∆U+∆ngRT where ∆ng=ng(Products)-ng(Reactant)a) H2(g)+I2(g)→2HI(g)    ∆ng=2-2=0b) N2(g)+3H2(g)→2NH3(g)     ∆ng=2-4=-2c) C(s)+O2(g)→CO2(g)    ∆ng=1-1=0d) HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)    ∆ng=0-0=0Option B is the answer

10. For which one of the reactions, ΔH is NOT equal to ΔU? a) H2(g) + I2(g)  2HI(g) b) N2(g) + 3H2(g)  2NH3(g) c) C(s) + O2(g)  CO2(g) d) HCl(aq) + NaOH(aq)  H2O(l)