Question

What is the true regarding complete combustion of gaseous isobutane‐

• A. $\Delta H=\Delta E$
• B. $\Delta H>\Delta E$
• C. $\Delta H=\Delta E=0$
• D. $\Delta H<\Delta E$

Answer 1

Answer: (D)

$C_4{H}_{10}\left(g\right)+6.5O_2\left(g\right)\to 4C{O}_2\left(g\right)+5H_2{O}_{(l)}$

$\Delta n=\left[4-7.5\right]=-3.5$

$\Delta H=\Delta E+\Delta n_g\text{RT}$

$\therefore \Delta H<\Delta E$