UTME CHEMISTRY ASSESSMENT 13/12/2024

An oxide \( \text{XO}_2 \) has a vapour density of 32. What is the atomic mass of \( X \)?

A gas exerts pressure on its container because?

The volume of a given gas is \( V \, \text{cm}^3 \) at \( P \, \text{mm Hg} \). What is the new volume of the gas if the pressure is reduced to half at constant temperature?

50 cm\(^3\) of gas was collected over water at \(10^\circ\text{C}\) and 765 mm Hg. Calculate the volume of the gas at S.T.P. if the saturated vapour pressure of water at \(10^\circ\text{C}\) is 5 mm Hg.

If the volume of a given mass of gas at 298 K and a pressure of \( 205.2 \times 10^3 \, \text{Nm}^{-2} \) is \( 2.12 \, \text{dm}^3 \), what is the volume of the gas at S.T.P.?
(Standard pressure = \( 101.3 \times 10^3 \, \text{Nm}^{-2} \), Standard temperature = 273 K)

A given amount of gas occupies \( 10.0 \, \text{dm}^3 \) at \( 4 \, \text{atm} \) and \( 273^\circ\text{C} \). The number of moles of the gas present is:
(Molar volume of gas at S.T.P. = \( 22.4 \, \text{dm}^3 \)).

Which of the following statements about intermolecular distances and cohesive forces between gas is NOT correct? They are

Two gases, A and B, diffuse under the same conditions. The molar mass of gas A is 16 g/mol, and the molar mass of gas B is 64 g/mol. If gas A diffuses at a rate of 2 cm³/s, what is the diffusion rate of gas B?

Hydrogen gas (\( H_2 \)) and oxygen gas (\( O_2 \)) are allowed to diffuse under identical conditions. The molar mass of \( H_2 \) is 2 g/mol, and the molar mass of \( O_2 \) is 32 g/mol. If the diffusion rate of hydrogen is \( 8 \, \text{cm}^3/\text{s} \), what is the diffusion rate of oxygen?

The vapor density of a gas is 22. What is the molar mass of the gas?