Enthalpy

The enthalpy change of a reaction is independent of

Define 'Enthalpy'

One mol of a non-ideal gas undergoes a change of state $(2.0 \mathrm{atm}, 3.0 \mathrm{L}, 95 \mathrm{K}) \to (4.0 \mathrm{atm}, 5.0 \mathrm{L}, 245 \mathrm{K})$ with a change in internal energy, $∆\mathrm{U}$$= 30.0 \mathrm{L} \mathrm{atm}$. The change in enthalpy $(∆\mathrm{H})$ of the process in $\mathrm{L} \mathrm{atm}$ is

On the basis of following data , calculate the heat of reaction $(\mathrm{kJ}/\mathrm{mol})$ for the given process.

${\mathrm{CH}}_4\left(\mathrm{g}\right)+2{\mathrm{O}}_2\left(\mathrm{g}\right)\mathrm{ }\to {\mathrm{CO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

$\mathrm{BE}(\mathrm{C}–\mathrm{H})=414\mathrm{kJ}/\mathrm{mol} , \mathrm{BE}(\mathrm{O}=\mathrm{O})=498\mathrm{kJ}/\mathrm{mol},$

$\mathrm{BE}(\mathrm{C}=\mathrm{O})=741\mathrm{kJ}/\mathrm{mol} , \mathrm{BE}(\mathrm{O}–\mathrm{H})=464\mathrm{kJ}/\mathrm{mol}$

If $20\mathrm{ }\mathrm{mL}$ of $\mathrm{HCl}$ is added to $20\mathrm{ }\mathrm{mL}$ of $\mathrm{NaOH}$ solution of same strength, $5°\mathrm{C}$ increment in temperature takes place. If $200$ $\mathrm{mL}$ of same $\mathrm{HCl}$ solution is mixed with $200\mathrm{ }\mathrm{mL}$ of same $\mathrm{NaOH}$ solution, temperature increases by-

Which of the following relationship between x and y will be true when equal volumes of $1 \mathrm{M}\mathrm{ }\mathrm{H}\mathrm{C}\mathrm{l}$ and $1 \mathrm{M}\mathrm{ }{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ are neutralized completely by dil. NaOH solution and $\mathrm{x}$ $\text{kcal}$ and $\mathrm{\text{y kcal}}$ heat are liberated respectively?

The value of ${\mathrm{\Delta H}}_{\mathrm{O}-\mathrm{H}}$ is $109 \mathrm{kCal}/\mathrm{mol}.$ The enthalpy of  formation of $1 \mathrm{mole}$of water in gaseous state from $\mathrm{H}\left(\mathrm{g}\right)$ and $\mathrm{O}\left(\mathrm{g}\right)$ is:

Figure out the number of reactions among the following which have $\Delta \mathrm{H}$ equal to $∆\mathrm{U}$

i. ${\mathrm{N}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)⟶2{\mathrm{NH}}_3\left(\mathrm{g}\right)$

ii. $2\mathrm{HI}\left(\mathrm{g}\right)⟶{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{I}}_2\left(\mathrm{g}\right)$

iii. $\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)⟶{\mathrm{CO}}_2\left(\mathrm{g}\right)$

iv. $2{\mathrm{NO}}_2\left(\mathrm{g}\right)⟶{\mathrm{N}}_2{\mathrm{O}}_4\left(\mathrm{g}\right)$

v. $2{\mathrm{SO}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)⟶2{\mathrm{SO}}_3\left(\mathrm{g}\right)$

vi. ${\mathrm{CH}}_4\left(\mathrm{g}\right)+2{\mathrm{O}}_2\left(\mathrm{g}\right)⟶{\mathrm{CO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

vii. $2{\mathrm{C}}_4{\mathrm{H}}_{10}\left(\mathrm{g}\right)+13{\mathrm{O}}_2\left(\mathrm{g}\right)\to 8{\mathrm{CO}}_2\left(\mathrm{g}\right)+10{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

viii. ${\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{Br}}_2\left(\mathrm{g}\right)⟶2\mathrm{HBr}\left(\mathrm{g}\right)$

In a constant pressure calorimeter, 3.5 g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase from 298.0 K to 298.45 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJ ${\mathrm{K}}^{-1}$ , the numerical value for the enthalpy of combustion of the gas in kJ $\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$ is

One mole of a non-ideal gas undergoes a change of state $(2.0 \mathrm{a}\mathrm{t}\mathrm{m},3.0 \mathrm{L},95 \mathrm{K})$ $\to (4 \mathrm{a}\mathrm{t}\mathrm{m}, 5 \mathrm{L}, 245 \mathrm{K})$ with a change in internal energy, $\mathrm{\Delta }\mathrm{E}=30.0 \mathrm{L} \mathrm{a}\mathrm{t}\mathrm{m}.$ The change in enthalpy, $\mathrm{\Delta }\mathrm{H}$ , of the process in L atm is

At $298 \mathrm{K, }$what will be the change in standard internal energy change for the given reaction?

${\mathrm{OF}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\to {\mathrm{O}}_2\left(\mathrm{g}\right)+2\mathrm{HF}\left(\mathrm{g}\right);∆\mathrm{H}=-310\mathrm{ }\mathrm{kJ}$

On combustion of $x$grams of ethanol in bomb calorimeter, $y$  joules of heat energy is produced. The heat of combustion of ethanol $\left(∆H_{\mathrm{c}\mathrm{o}\mathrm{m}\mathrm{b}}\right)$ is:

What would be the heat released when an aqueous solution containing $0.5$ mole of ${\mathrm{HNO}}_3$ is mixed with $0.3$ mole of ${\mathrm{OH}}^{-}$?

(Enthalpy of neutralization is $-57.1\mathrm{ }\mathrm{kJ}$.)

In blast furnace, the highest temperature is in

The relationship between enthalpy change and internal energy change is

For the reaction: ${\mathrm{N}}_2+3{\mathrm{H}}_2\mathrm{ }\rightleftharpoons 2\mathrm{N}{\mathrm{H}}_3$

Which one of the following is correct regarding $∆\mathrm{H}?$

The heat of formation of methane at constant pressure is $18500 \mathrm{cal}$ at ${25}^{\mathrm{o}}\mathrm{C}$ . What would be the heat of reaction at constant volume?
(Given: $\mathrm{C}\left(\mathrm{s}\right)+2{\mathrm{H}}_2\left(\mathrm{g}\right)⟶{\mathrm{CH}}_4\left(\mathrm{g}\right)+18500\mathrm{ }\mathrm{cal}$; $\mathrm{R}=2\mathrm{cal}$)

The $∆{\mathrm{H}}_{\mathrm{f}}^{\mathrm{o}}$ for $\mathrm{C}{\mathrm{O}}_{2\left(\mathrm{g}\right)}$ , CO (g) and ${\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$ are -393.5, -110.5 and $-241.8\mathrm{ }\mathrm{K}\mathrm{J}.\mathrm{ }\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$ respectively. The standard enthalpy change (in KJ) for the reaction

$\mathrm{C}{\mathrm{O}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)\to \mathrm{C}\mathrm{O}\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$ is

Which of the following equations correctly represents the standard heat of formation $\left(∆{\mathrm{H}}_{\mathrm{f}}^{\mathrm{o}}\right)$ of methane?