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# How do you find the molar mass of a volatile liquid?

## How do you find the molar mass of a volatile liquid?

number of moles = n = pV/RT . But we go one step further, because we will also measure the mass of the evaporated liquid. Knowing the mass and the number of moles will allow us to compute the molar mass of the liquid: molar mass = (mass)/(number of moles).

What is the most accurate way of measuring the molar mass of a volatile compound?

The Dumas method of analysis can provide a fairly accurate determination of molar mass. V is the volume in liters of the vessel in which the liquid is vaporized and T is the temperature in kelvins of the vapor.

### What happens to the volatile liquid that is placed in the flask?

The flask is heated in boiling water. The liquid vaporizes, the vapors fill the flask and excess vapor leaves through the hole. Since the flask is open to the air, the pressure of the vapor will be the same as the atmospheric pressure. The gas temperature will be that of the boiling water.

Why is it not necessary to know the mass of the volatile liquid initially added to the flask?

It is not necessary to weigh the amount of liquid initially put into the flask because a large amount of the liquid is excess. We are concerned only with the vapor that fills the flask after the excess liquid has evaporated and exited the flask.

#### How is volatility of a liquid calculated?

Scientists commonly use the boiling point of a liquid as the measure of volatility.

1. Volatile liquids have low boiling points.
2. A liquid with a low boiling point will begin to boil faster than liquids with higher boiling points.

What are volatile liquids?

A volatile liquid is one that evaporates or vaporizes quickly at room temperature. Volatile liquids have low boiling point. As a result, they evaporate very easily at room temperature.

## Why is it necessary for you to determine the mass of the volatile liquid before heating it?

because, as you heat this gas, you are creating sufficient vapor to drive out the air so to have the vapor of the liquid present,the test tube will contain only the vapor that you require to calculate the molar mass. 2.

How would the molecular weight for a volatile liquid be affected if the balance you did your weighing on had an error of 2.3 g?

If the weight has an error of 2.3 g, the resulting mass of volatile liquid will be less than its actual mass.

### How do you find the mass of a liquid without density?

The easiest way to find the mass of anything is to weigh it. You’re actually measuring the force of gravity on the object, and technically, you should divide the weight by the acceleration due to gravity to get the mass.

Which is a volatile liquid?

In short, volatile liquids are the liquids that evaporate at room temperature or can vaporise easily. They have low boiling points. They include ethanol, acetone, petrol, ether, etc. Thus, volatile liquids evaporate quickly at room temperature.