What is the enthalpy of formation of FeS (in kJ/mol) if 2.1 g of Fe combines with sulfur and releases 3.77 kJ of heat?

1.	– 3.77	2.	– 1.79
3.	– 100.5	4.	None of these

Which is an extensive property?

What is the amount of work done by an ideal gas, if the gas expands isothermally from \(10^{-3}~m^3\) to \(10^{-2}~m^3\) at \(300~K\)against a constant pressure of \(10^{5}~Nm^{-2}\)?

Reversible expansion of an ideal gas under isothermal and adiabatic conditions are shown in the figure:

AB$\to$Isothermal expansion

AC$\to$Adiabatic expansion

Which of the following options is not correct?

Which of the following processes shows a decrease in entropy?

1. \(2 \text H \left(g\right)\rightarrow\text H_{2} \left(g\right)\)

2. Evaporation of water

3. Expansion of a gas at a constant temperature

4. Sublimation of a solid to a gas

Under the isothermal condition, a gas at \(300 \mathrm{~K}\) expands from \(0.1 \mathrm{~L}\) to \(0.25 \mathrm{~L}\) against a constant external pressure of 2 bar. The work done by the gas is:

Assuming each reaction is carried out in an open container,
Reaction that shows ΔH=ΔE is :

1. $H_2\left(g\right)+B{r}_2\left(g\right)\to 2HBr\left(g\right)$

2. $C\left(s\right)+2H_{2}O\left(g\right)\to 2H_2\left(g\right)+C{O}_2\left(g\right)$

3. $PC{l}_5\left(g\right)\to PC{l}_3\left(g\right)+C{l}_2\left(g\right)$

4. $2CO\left(g\right)+O_2\left(g\right)\to 2C{O}_2\left(g\right)$

The bond energy of H—H and Cl-Cl is 430 kJ
mol^-1 and 240 kJ mol^-1 respectively and ΔH_f for HCl is -90 kJ mol^-1. The bond enthalpy of HCl is:

1. 290 $kJ$ $mo{l}^{-1}$

2. 380 $kJ$ $mo{l}^{-1}$

3. 425 $kJ$ $mo{l}^{-1}$

4. 245 $kJ$ $mo{l}^{-1}$

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0ºC. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be-
(R = 8.314 J/mol K) (ln 7.5 = 2.01)