18) For which of these reactions will the difference between AHP (the change in

Question

18) For which of these reactions will the difference between AHP (the change in enthalpy) and in internal energy) be the greatest? A) 2H20:0) 2H2O(l) + O2(g) B) CaCOs(s) CaO(s) + CO2(g) C) NO(g) + Os(g) NO2(g) + O2(g) D) 2C2Hdg) + 702(g) 4C02(g) .+ 6H20(1) E) 4NH3(g) + 502(g) 4N0(g) + 6H2O(g) (the change Answer 19) For which of these ea tions will the difference between H (the change in enthalpy) and E(the change in internal energy) be the smallest? A) N2(g) + 3H2(g) 2NH3(g) B) 4PHdg-P4(g) + 6H2(g) C) H2(g) + Cl2(g) 2HCl(g) D) CO2(g) + 2H20(1) CHdg) + 202(g) E) P4(s) + 10C12(g) 4 PC,(s) Answer (

Explanation / Answer

18)

delta H = delta U + delta n * R*T

delta n is difference in number of gas between reactant and product

When delta n is largest, difference between delta H and delta U will be greatest

delta n for A = 1

delta n for B = 1

delta n for C = 0

delta n for D = 5

delta n for E = 1

Answer: D

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