Question

Victor Meyer's method is used for the determination of the molecular mass of a non-volatile compound.
(A) True
(B) False

Answer 1

To solve this question we first need to know what is molecular mass. The mass of one mole of the substance, i.e., exactly $6.022\times {{10}^{23}}$ particles, is said to be the molecular mass of that substance.

Complete answer:
Let us first understand what a non-volatile compound is. A compound that does not evaporate into gas easily under existing conditions is known as a non-volatile compound.
Non-volatile compounds have a high boiling point and a low vapor pressure.
Common examples of non-volatile compounds are salt and sugar.
The molecular mass of non-volatile compounds can be determined using cryoscopic methods.
Hence we can conclude that the given statement is false.

The correct answer is option (B) False.

Note:
Let us understand Victor Meyer's method.
The molecular mass of volatile organic compounds can be determined using Victor Meyer's method.
In an instrument known as the Victor Meyer's tube, a compound whose mass is known is vaporized. The vapors thus displace air into the graduated tube having an equal volume. Then the volume of the vapors is measured and then reduced to standard temperature and pressure (STP).
At STP, vapors obtained from 1 mole of the volatile compound have a volume equal to 22400 ml.
V ml is the volume of vapors obtained from the volatile compound at STP.
Hence, we can say that $\dfrac{V}{22400}$ ml of the compound gives V ml of vapors.
Since we know that number of moles (n) = $\dfrac{W}{M}$, where M is the molecular weight of the sample and W is the weight of the sample.
So, we can say that
$\dfrac{V}{22400}=\dfrac{W}{M}$
This formula can be used to determine the molecular mass of a volatile organic compound using Victor Meyer's method.