Table of Contents

- 1 Can mole fraction be more than 1?
- 2 What is the mole fraction of ethanol in the vapor above the solution?
- 3 What is the relation between mole fraction and molality?
- 4 What is the difference between mole fraction and mass fraction?
- 5 Which of the following is correct relation between mole fraction and molality?
- 6 Why do mass fraction and mole fraction have no units?
- 7 Why is the mole fraction equal to unity?
- 8 Why are high mole fractions used in sisfets?

## Can mole fraction be more than 1?

Mole fractions are dimensionless, and the sum of all mole fractions in a given mixture is always equal to 1.

**Why is mole fraction always 1?**

Mole fraction represents the number of molecules of a particular component in a mixture divided by the total number of moles in the given mixture. It’s a way of expressing the concentration of a solution. Therefore, the sum of mole fraction of all the components is always equal to one.

### What is the mole fraction of ethanol in the vapor above the solution?

XC2H5OH = 0.471 The mole fraction of ethanol in vapor above solution is 0.471.

**What is the relation between concentration and mole fraction?**

Whereas mole fraction is a ratio of moles to moles, molar concentration is a quotient of moles to volume. The mole fraction is one way of expressing the composition of a mixture with a dimensionless quantity; mass fraction (percentage by weight, wt\%) and volume fraction (percentage by volume, vol\%) are others.

## What is the relation between mole fraction and molality?

The mole fraction of any component of a solution is defined as the ratio of the number of moles of that component present in the solution to the total number of moles of all the components of the solution. Molality is defined as the total moles of a solute contained in a kilogram of a solvent.

**How are partial and mole fraction related?**

The sum of the mole fractions of all the components present must equal 1. That is, the partial pressure of any gas in a mixture is the total pressure multiplied by the mole fraction of that gas. This conclusion is a direct result of the ideal gas law, which assumes that all gas particles behave ideally.

### What is the difference between mole fraction and mass fraction?

Mole Fraction vs Mass Fraction Mole fraction is the ratio between the moles of a constituent and the sum of moles of all constituents in a mixture. Mass fraction is the ratio between the mass of a constituent and the total mass of a mixture.

**How do you find the mole fraction of vapor above a solution?**

In order to find the mole fraction of methanol in the vapor phase, i.e. above the solution, use the fact that the partial pressure of methanol above the solution is equal to the mole fraction of methanol above the solution multiplied by the total pressure above the solution.

## Which of the following is correct relation between mole fraction and molality?

The correct relationship between molarity (M) and molality (m) is (d = density of the solution, in kgL−1, M2= molar mass of the solute in kg mol−1)

**Which of the following is correct relationship between mole fraction and number of moles?**

### Why do mass fraction and mole fraction have no units?

Mole fraction =number of moles of one component÷totalnumber of moles of all the component. that means it is the ratio of same quantity that is moles so it get cancelled out the units.

**Does mole fraction vary from sample to sample?**

The mole fraction is an intensive property. So, it would not vary from sample to sample for a given uniform mixture. It is also independent of temperature and pressure. The sum of each mole fraction in a mixture is always equal to one.

## Why is the mole fraction equal to unity?

The mole fraction is not equal to unity. However, the sum of the mole fractions of the components is equal to unity. For instance for a mole A and mole B, the mole fraction A, XA = mole A/ (mole A + mole B), mole fraction B, XB = mole B/ (mole A + mole B)

**What are the advantages and disadvantages of molar fraction?**

Advantages of molar fraction 1 Mole fraction is not dependent on the temperature. 2 The information about the density of the phase is not necessary to calculate the mole fraction. 3 In the case of an ideal gas mixture, the mole fraction is represented by the ratio of partial pressure to total pressure… More

### Why are high mole fractions used in sisfets?

High mole fractions give a smaller temperature, and also voltage, dependence to the leakage current, so they are more suited to circuits operating over a wide temperature range. Field emission currents place a limit on the maximum charge density nch,max in the SISFET channel, since ench,max = εI ( FI,max − FB ).