Recent questions in Properties of Pure Substances

Which of the following is/are example(s) of a pure substance at $25^{\circ} \mathrm{~C}$ and $101$ $\mathrm{kPa}$?Gaseous oxygenMixture of liquid water and water vaporMix...

A rigid and impermeable tank has only moist air with a specific humidity of $0.025 \mathrm{~kg}_{\text {water-vapor }} / \mathrm{kg}_{\text{dry-air}}$ at $30^{\circ} \mat...

A rigid tank of $300 \: \mathrm{litre}$ capacity contains $3 \: \mathrm{kg}$ of oxygen (molar mass $=32 \mathrm{~kg} / \mathrm{kmol}$ ) at $25^{\circ} \mathrm{C}$. If oxy...

​​​​For a pure substance that expands on freezing, which of the following statement(s) is/are $\textsf{CORRECT}$?Temperature of the liquid phase can be lower than the tem...

A piston-cylinder assembly having $250 \: \mathrm{mm}$ diameter contains $0.01 \: \mathrm{kg}$ of water vapor at $1 \: \mathrm{MPa}$ and $200^{\circ} \mathrm{C}$. The spe...

A steam boiler contains saturated water vapour at $200^{\circ} \mathrm{C}$. After a certain period, the temperature of the boiler drops to $110^{\circ} \mathrm{C}$. Assum...

Consider that specific heat $\left(0\right.$ to $\left.50^{\circ} \mathrm{C}\right)$ of water, water vapour and air remains constant: $4.48,1.88$ and $1.0 \mathrm{~kJ} /\...

The figure shows four different processes labeled $1,2,3$, and $4$ for the same closed system containing an ideal gas. The curves labeled $T_{1}, T_{2}$, and $T_{3}$ are ...

Following data is for an actual vapour compression refrigeration cycle. Enthalpy at compressor inlet: $246 \mathrm{~kJ} / \mathrm{kg}$Enthalpy at compressor exit: $286 \m...

A rigid tank, initially at $1$ bar and $300$ K, contains $5$ moles of $\mathrm{O}_{2}, 4$ moles of $\mathrm{N}_{2}$, and 3 moles of $\mathrm{H}_{2}$. From this tank, $2$ ...

\begin{tabular}{|l|l|}\hline Q.89 & Which of the following is an extensive property of a system? \\\hline& Density \\\hline& Pressure \\\hline& Temperature \\\hline& Tota...

\begin{tabular}{|c|c|}\hline Q. 94 & \begin{tabular}{l}An insulated rigid closed tank of $2 \mathrm{~m}^{3}$ internal volume contains saturated liquid- \\vapor mixture of...

Q. 95 A rigid closed tank contains $2 \mathrm{~kg}$ of an ideal gas at $500 \mathrm{kPa}$ and $350 \mathrm{~K}$. A valve is opened, and half of the mass of the gas is all...

Q. 103 A rigid tank of $2 \mathrm{~m}^{3}$ internal volume contains $5 \mathrm{~kg}$ of water as a saturated liquid-vapor mixture at $400 \mathrm{kPa}$. Half of the mass ...

Q. 107In an air-conditioning system, air enters at $20{ }^{\circ} \mathrm{C}$ and $30 \%$ relative humidity at a steady rate of $30 \mathrm{~m}^{3} / \mathrm{min}$ in a h...