1 mol of oxygen has fewer molecules. … Each sample has the same number of molecules. The molecules cannot be compared without knowing the mass. Each sample has the same number of molecules.

## What must be the same when comparing 1 mol of oxygen gas?

Explanation : When comparing 1 mol of oxygen gas with 1 mol of carbon monoxide the number of molecules must be same. Each mole should contains in it. Irrespective of the weight or atomic number avogadro’s number remains constant for every mole of atom.

## How are a mole and a dozen similar?

One mole consists of Avogadro’s number of atoms i.e., 6.02×1023 atoms. – The amount of atoms in 12.0 grams of Carbon; 12 is the same as Avogadro’s number as it is for 1 mole of carbon i.e. a sample of 12 grams of carbon is equal to its one mole. Therefore, it is similar to a dozen.

## How many molecules are in 1 mole of molecules?

Avogadro’s Number and the Mole. The mole is represented by Avogadro’s number, which is 6.022×1023 atoms or molecules per mol.

## Which value gives the number of particles in 1 mol of a substance?

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro’s number or Avogadro’s constant.

## What is the mole ratio of oxygen to pentane?

Answer: The mole ratio of oxygen to pentane for the combustion of pentane is 8 : 1.

## Which symbol can be used to indicate a chemical reaction?

The symbol that can be used to indicate a chemical reaction that takes place in the presence of a catalyst is letter B: Pt. Platinum is the metal which is often used as a heterogeneous catalysts for several reactions. Catalyst lowers the activation barrier of reaction, thereby accelerating the reactions rates.

## What is the mole ratio of hydrogen to ammonia?

So, the ratio of hydrogen to ammonia is 3:2.

## Why is a mole called a chemists dozen?

It is called a chemist’s dozen because, just as we use the term ‘dozen’ in our day-to-day life, chemists use the ‘mole’ to do their experiments. Just as 12 eggs is a dozen eggs, 6.02 × 10^23 eggs is a mole of eggs. … Thus, a mole is called a chemists dozen.

## How many particles are in one mole of anything?

A mole (mol) is the amount of a substance that contains 6.02 × 10 23 representative particles of that substance. The mole is the SI unit for amount of a substance. Just like the dozen and the gross, it is a name that stands for a number. There are therefore 6.02 × 10 23 water molecules in a mole of water molecules.

## How many molecules are in a mole of oxygen?

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

## How many molecules are in a gram?

The definition of Avogadro’s number of 6.022 × 1023/mole is the number of atoms or molecules per one gram atomic weight. For one gram atomic weight of hydrogen with atomic weight of one gram, one mole of hydrogen contains 6.022 × 1023 hydrogen atoms.

## How many molecules are in the human body?

The body consists of about 2×10^25 molecules. That’s a 2 with 25 zeros. More than 99 % of them are water!

## What is the relationship between mole Avogadro number and mass?

Avogadro’s number is an absolute number: there are 6.022×1023 elementary entities in 1 mole. This can also be written as 6.022×1023 mol-1. The mass of one mole of a substance is equal to that substance’s molecular weight.

## How do you find the number of molecules in a substance?

Explanation: Determine the mass of the substance, and its molar mass. Divide the given mass by its molar mass to get moles, then multiply times 6.022×1023molecules1mol .

## What is the relationship between mole Avogadro number and mass class 9?

Avogadro’s number is a proportion that relates molar mass on an atomic scale to physical mass on a human scale. Avogadro’s number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022×1023 mol-1 and is expressed as the symbol NA.