Applications of Thermodynamics: Enthalpy

For the reaction :

${\mathrm{C}}_3{{\mathrm{H}}_8}_{\left(\mathrm{g}\right)}+5{{\mathrm{O}}_2}_{\left(\mathrm{g}\right)}\to 3{\mathrm{CO}}_{2\left(\mathrm{g}\right)}+3{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{l}\right)}$

$∆\mathrm{H}-∆\mathrm{U}$ at constant temperature is 

When a $60 \mathrm{W}$ electric heater is immersed in a gas for $100 \mathrm{s}$ in a constant volume container with adiabatic walls, the temperature of the gas rises by $5°\mathrm{C}$. The heat capacity of the given gas is ${\mathrm{JK}}^{-1}$ (Nearest integer)

Change in internal energy of an ideal gas is given by$∆\mathrm{U}={\mathrm{nC}}_{\mathrm{v}}∆\mathrm{T}$. Explain?

Heat of reaction for, ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{s}\right)+6{\mathrm{O}}_2\left(\mathrm{g}\right)⟶6{\mathrm{CO}}_2\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{v}\right)$ at constant pressure is $-651 \mathrm{kcal}$ at $17°\mathrm{C}$. Calculate the heat of reaction at constant volume at $17°\mathrm{C}$.

Among the following standard enthalpy of formation is non-zero for

$2$ mol of ${\mathrm{Hg}}_{\left(\mathrm{g}\right)}$ is combusted in a fixed volume bomb calorimeter with excess of ${\mathrm{O}}_2$ at $298 \mathrm{K}$ and $1$ atm into ${\mathrm{HgO}}_{\left(\mathrm{s}\right)}$. During the reaction, temperature increases from $298.0 \mathrm{K}$ to $312.8 \mathrm{K}$. If heat capacity of the bomb calorimeter and enthalpy of formation of ${\mathrm{Hg}}_{\left(\mathrm{g}\right) }$are $20.00 \mathrm{kJ} {\mathrm{K}}^{-1}$ and $61.32 \mathrm{kJ} {\mathrm{mol}}^{-1}$ at $298 \mathrm{K}$, respectively, the calculated standard molar enthalpy of formation of ${\mathrm{HgO}}_{\left(\mathrm{s}\right)}$ at $298 \mathrm{K}$ is $\mathrm{X} \mathrm{kJ} {\mathrm{mol}}^{-1}$. The value of$\left|\mathrm{X}\right|$ is ____. [Given: Gas constant $\mathrm{R} = 8.3 \mathrm{J} {\mathrm{K}}^{-1 }{\mathrm{mol}}^{-1}$]

What is enthalpy?

A $150 \mathrm{W}$ heater was placed in $1.00 \mathrm{kg}$of methanol$\left({\mathrm{CH}}_3\mathrm{OH}\right)$ and turned on for exactly for $1 \min$. The temperature increased by $3.54 \mathrm{K}$. Assuming that all the heat is absorbed by methanol, the molar heat capacity of methanol is 

The difference between the value of ${\mathrm{C}}_{\mathrm{p}}$ of ${\mathrm{H}}_2$ and ${\mathrm{C}}_{\mathrm{v}}$ of $\mathrm{He}$ will be :

Which statement is correct?

The density of a substance is $400{\mathrm{kgm}}^{-3}$ and that of another substance is $600{\mathrm{kgm}}^{-3}$ . The heat capacity of $40\mathrm{c}.\mathrm{c}$ of first substance is equal to that of $30\mathrm{c}.\mathrm{c}$ of second substance. The ratio of their specific heats is

What is enthalphy?

Heat required to raise the temperature of $54 \mathrm{g}$ of steam (${\mathrm{H}}_2\mathrm{O}$) by $5°\mathrm{C}$ in a rigid and closed vessel is

Which of the following has lowest specific heat value

From the following data at constant volume for combustion of benzene, calculate the heat of this reaction at constant pressure condition.
${\mathrm{C}}_6{\mathrm{H}}_6\left(\mathrm{l}\right)+7\frac{1}{2}{\mathrm{O}}_2\left(\mathrm{g}\right)\to 6{\mathrm{CO}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$,  $\mathrm{\Delta U}$ at $△\mathrm{U}=-3268.12 \mathrm{kJ}$.

$5 \mathrm{moles}$ of an ideal monoatomic gas undergoes adiabatic expansion from $5 \mathrm{L} \text{to} 20 \mathrm{L}$ against a constant external pressure of $2 \mathrm{bar}$.

One mole ideal monoatomic gas is heated according to path $\mathrm{AB}$ and $\mathrm{AC}$. If temperature of state $\mathrm{B}$ and state $\mathrm{C}$ are equal.
Calculate $\frac{{\mathrm{q}}_{\mathrm{AC}}}{{\mathrm{q}}_{\mathrm{AB}}}\times 10$.

Round off your to the nearest integer.

A monoatomic ideal gas kept in a vessel fitted with a piston is expanded irreversibly from its initial state ($1\mathrm{L},1\mathrm{atm}, \mathrm{at} 300\mathrm{K}$) to the final state ($10\mathrm{L},420\mathrm{K}$). The enthalpy and entropy changes in the process are, respectively

Value of $\mathrm{\gamma }$ for ${\mathrm{CH}}_4$ molecule is (Consider vibrational degree of freedom to be active)

When equal volumes of Helium and Neon at same temperature and pressure are mixed, the ratio ${\mathrm{C}}_{\mathrm{p}}:{\mathrm{C}}_{\mathrm{v}}$ of the mixture equals: