The standard enthalpies of formation of 1, 3- butadiene (g), , CO… - Vidyadip

MCQ

The standard enthalpies of formation of $1, 3-$ butadiene $(g),\, CO_2(g)$ and $H_2O(g)$ at $298\,K$ are $-30, -94$ and $-68\,\, kcal/ mol,$ respectively. If the magnitude of resonance enthalpies of $1,3-$ butadiene and $CO_2$ are $10$ and $20\,\, kcal/mol,$ respectively, the enthalpy of combustion of $1, 3-$butadiene $(g)$ at $298\,K,$ is........$kcal / mol$ (enthalpy of vaporisation of $H_2O(l)$ at $298\,K = 10 \,\,kcal/mol$)

✓
$-650$
B
$+650$
C
$-680$
D
$-620$

✓

Answer

Correct option: A.

$-650$

a
${{\text{C}}_4}{{\text{H}}_6}({\text{g}}) + \frac{{11}}{2}{{\text{O}}_2}({\text{g}}) \to 4{\text{C}}{{\text{O}}_2}({\text{g}}) + 3{{\text{H}}_2}{\text{O}}(l)$

$\Delta {\text{H}} = [4 \times ( - 94) + 3 \times ( - 68)] - [ - 30] + $

$10 - 4 \times 20 - 3 \times 10$

$=-650\, \mathrm{kcal} / \mathrm{mol}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 5. Thermodynamics and thermochemistry→5. Thermodynamics and thermochemistry — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The value of equilibrium constant of the reaction

$HI \rightleftharpoons \frac {1}{2} H_{2(g)} + \frac{1}{2} I_{2(g)}$

is $8.0$. The equilibrium constant of the reaction

$H_{2( g )} + I_{2(g)} \rightleftharpoons 2HI_{ ( g )}$ will be

$3-$ Methyl$-$pent ${-2}-$ ene on reaction with $HBr$ in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is

The heat of formation is the change in enthalpy accompanying the formation of a substance from its elements at $298\, K $ and $1 \,atm$ pressure. Since the enthalpies of elements are taken to be zero, the heat of formation $(\Delta H)$ of compounds

$Z_{eff}$ of $B$ is $2.6$, then value of zeff of oxygen and fluorine will be :-

At $25^{\circ} C$ and 1 atm pressure, the enthalpies of combustion are as given below:

Substance	$H _{2}$	$C ($ graphite $)$	$C _{2} H _{6}( g )$
$\frac{\Delta_{ C } H ^{\Theta}}{ kJmol ^{-1}}$	$-286.0$	$-394.0$	$-1560.0$

The enthalpy of formation of ethane is ........ .

What is $\ce{pH}$ of resulting solution when equal volume when equal of $0.1M ,\ce{NaOH}$ and $0.01M, \ce{HCl}$ are mixed? $[\log 4.5 = 0.65]$

The equilibrium constant for a reaction,

$A + B \rightleftharpoons C + D$ is $1 \times 10^{-2}$ at $298\, K$ and is

$2$ at $273\, K$. The chemical process resulting in the formation of $C$ and $D$ is

Some inert gas is added at constant volume to the following reaction at equilibrium

$N{H_4}HS(s) \rightleftharpoons N{H_3}(g) + {H_2}S(g)$

Predict the effect of adding the inert gas

The electronic configuration of three elements $A,B$ and $C$ are given below. The bond between $B$ and $C$ will be

$A : 1s^2\, 2s^2\, 2p^6$
$B : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^3$
$C : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^5$

Which of the following is not the use of $\ce{H_2O_2}$ in the environmental chemistry?