The heat of combustion of solid benzoic acid at constant volume is -321.30 kJ at 27^° C. The heat of combustion at constant pressure is (-321.30-x R) kJ, the value of x is __________.

C_6 H_5 COOH( s)+(15 / 2) O_2( g) \ -> 7 CO_2( g)+3 H_2 O( I) Delta H=Delta U+Delta n_9 R T \ Delta H=-321.30-(1 / 2) R x 300 So, x=150

Home
Test SeriesNEW!
New AppNEW!
About Us

Courses

Virat Batch 2027
Champion Batch 2028
Divine JEE 1-on-1

Contact Us
Knowledge Check

Test Series

The heat of combustion of solid benzoic acid at constan... | (Chemistry) | DivineJEE

Home
Test SeriesNEW!
New AppNEW!
About Us

Courses

Virat Batch 2027
Champion Batch 2028
Divine JEE 1-on-1

Contact Us
Knowledge Check

Test Series

Chemistry

Exam

Chemistry

The heat of combustion of solid benzoic acid at constant volume is $-321.30 \mathrm{~kJ}$ at $27^{\circ} \mathrm{C}$ . The heat of combustion at constant pressure is $(-321.30-x \mathrm{R}) \mathrm{~kJ}$ , the value of $x$ is __________.

Prev Next

Explanation

$\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}(\mathrm{s})+\frac{15}{2} \mathrm{O}_2(\mathrm{~g}) \\ \longrightarrow 7 \mathrm{CO}_2(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{I})$

$\begin{aligned} & \Delta \mathrm{H}=\Delta \mathrm{U}+\Delta \mathrm{n}_9 R T \\ & \Delta \mathrm{H}=-321.30-\frac{1}{2} \mathrm{R} \times 300 \end{aligned}$