Question

To determine the molecular weight of thevolatile compound it is necessary to knowthe temperature of the gas beforecondensation and the volume of thecontainer.TrueFalse

Answer 1

Answer

TRUE

Explanation

Since the ideal gas law, states that the pressure, P, volume, V, and temperature, T of the gas are related to the number of moles, n, by the following equation:

$PV=nRT$

Also, the number of moles can be rewritten as reacting mass, m divided by molecular mass, M:

$n=\frac{m}{M}$

So, the ideal gas law can be written in terms of m and M:

$PV=\frac{m}{M}RT$

Hence, to determine the molecular weight of the volatile compound it is necessary to know the temperature of the gas before condensation and the volume of the container. TRUE.