Question

at a fixed temperature and pressure, a cylinder contains equal volumes of o2 and an unknown gas, weighing 20.0 g and 17.5 g respectively. what is the identity of the unknown gas?

Answer 1

At a fixed temperature and pressure, a cylinder contains equal volumes of O2 and an unknown gas. The identity of the unknown gas CO.

The number of moles of a given substance is calculated by dividing the mass by the molar mass.

The number of moles of O₂ = $\mathbf{=\dfrac{20.0 \ g}{32 \ g/mol}}$

= 0.625 moles.

Based on the given assumption, at fixed temperature and pressure;

• Let assume that the number of moles of the unknown gas is = 0.625 moles  

The molar mass of the unknown gas can be estimated as:

$\mathbf{= \dfrac{mass}{number \ of \ moles}}$

$\mathbf{= \dfrac{17.5 \ g}{0.625 \ moles}}$

= 28 g/mol

Therefore, we can conclude that the unknown gas is CO.

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