Thermodynamics ...

The specific heat of a gas is found to be $$0.075$$ calories at constant volume and its formula weight is $$40$$. The atomicity of the gas would be:

A piston cylinder device initially contains $$0.2m^3$$ neon (assume ideal) at 200 kPa inside at $$T_1 ^0C$$. A value is now opened and neon is allowed to escape until the volume reduces to half the initial volume. At the same time heat transfer with outside at $$T_2 ^0C$$  ensures a constant temperature inside. Select the statement(s) for given process :

Consider the reaction at $$300\ K$$, $$H_{2}(g) + Cl_{2}(g)\rightarrow 2HCl(g), \ \ \ \Delta H^{\circ} = -185\ kJ$$

Given the bond energies $$N \equiv N$$, $$H - H$$ and $$N - H$$ bonds are 945, 436 and 391 KJ $$mole^{-1}$$ respectively, the enthalpy of the following reaction $$N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}$$ is:

$${ H }_{ 2 }\left( g \right) +\dfrac { 1 }{ 2 } { O }_{ 2 }\left( g \right) \longrightarrow { H }_{ 2 }O\left( l \right)$$
$${ H }_{ 2 }O\left( l \right) \longrightarrow { H }_{ 2 }O\left( g \right); \Delta H={ x }_{ 4 }$$
Given,
$${ E }_{ H-H }={ x }_{ 1 }$$
$${ E }_{ O-O }={ x }_{ 2 }$$
$${ E }_{ O-H }={ x }_{ 3 }$$
$$\Delta { H }_{ F }$$ of $${ H }_{ 2 }O$$ vapour is:

$$Al^{3+} (aq) + 3e^{-}\rightarrow Al(s); E^{\circ} = -1.66\ V$$
$$Cu^{2+} (aq) + 2e^{-}\rightarrow Cu(s); E^{\circ} = + 0.34\ V$$
What voltage is produced under standard conditions to give a spontaneous reactions by combination of these two-half cells?

What is the heat produced when 4 g of anhydrous solid is added to 50 g of water?

The standard Gibbs energy change for a gaseous reaction at 27 is X Kcal. If equilibrium constant a reaction is 100 and R is 2 cal $${ K }^{ -1 }\ { mol }^{ -1 }$$. Then X is:

Which of the following statement(s) is/are true?
"Internal energy of an ideal gas ............"

The heat released in the neutralisation of HCI and NaOH is 13.7 kcal/mol, the heat
released on neutralisation of NaOH with $$ { CH }_{ 3 }COOH$$ is 3.7 kcal/mol.
The $${ \Delta H }^{ }$$ of ionisation of $${ CH }_{ 3 }COOH$$ is: