Competition Focus

What is the kinetic energy of $1 \mathrm{g}$ of ${\mathrm{O}}_2$ at $47 °\mathrm{C}$?

A gas taken in a closed vessel is heated from $27 °\mathrm{C}$ to $627 °\mathrm{C}$. The pressure of the gas will become _____ times the original pressure.

At the same pressure, the rate of diffusion of a gas at $927 °\mathrm{C}$ will be _____ times that at $27 °\mathrm{C}$.

The rate of diffusion of a gas at $8$ atmospheric pressure will be _____ times that at $2$ atmospheric pressure, temperature remaining constant.

If pressure of a gas is quadrupled and the temperature in degrees Kelvin is doubled, the density of the gas will become _____ times.

The temperature of a gas is increased from $27 °\mathrm{C}$ to $927 °\mathrm{C}$, the root-mean-square speed will become _____ times.

A highly viscous liquid was heated from $10 °\mathrm{C}$ to $14 °\mathrm{C}$. The percent decrease in viscosity will be about

At $400 \mathrm{K}$, the root-mean-square (rms) speed of a gas $\mathrm{X}$ (molecular weight$=40$) is equal to the most probable speed of gas $\mathrm{Y}$ at $60 \mathrm{K}$. The molecular weight of $\mathrm{Y}$ is