# How do you do Numericals on mole concept?

## How do you do Numericals on mole concept?

1. 1 mole of H2S contains 2 mole of H, 1 mole of S.
2. Molecular mass of KClO3= 39+35.5+3×16=122.5 39 + 35.5 + 3 × 16 = 122.5.
3. No.
4. Molar mass pf methane =16.
5. Molecular mass of CH4= 12+4×1=16 12 + 4 × 1 = 16.
6. Moles of oxygen atoms in 1 mole of Na2CO3.10H2O = 3+10 = 13.
7. Moles of CO2 C O 2 in 88 g = 88/44 = 2.
8. 1 mole of 14C=14 g.

How many atoms of hydrogen are there in 36 g of NH?

The formula mass of ammonia is 14 + 1 3 = 17. The number of moles in 36 g ammonia is 36/ 17 = 2.11mol. A mole is 6.02 10, so the number of hydrogen atoms in a 2.11 moles of ammonia is 2.11 *6.02*10^23 = 1.27 *10^24 atoms . Hope it helps!

What is mole Class 9 Ncert?

One mole of molecule or ion refers to the quantity in number possessing a mass equal to its atomic or molecular mass in grams. Number of particles present in one mole of any substance is 6.022 X 1023. This value is called Avogadro number. So we get 1 mole = 6.022 X 1023 in number.

### What is the value of 1 mole?

6.02214076 × 1023
A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

What is mole concept?

A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions, etc.) The molar mass of an element (or compound) is the mass in grams of 1 mole of that substance, a property expressed in units of grams per mole (g/mol) (see Figure 1).

How do you find the molar mass of Class 9?

To calculate the molar mass, the atomic mass of each substance is multiplied with the subscript of that element in the chemical formula. Then the masses of all the elements are added.

#### What is a mole concept?

Mole concept is one of the most convenient ways of expressing amount of reactants and product in reaction. The word “mole” was introduced around 1896 by Wilhelm Ostwald who derived the term from the Latin word moles meaning a ‘heap’ or ‘pile.

What is the mole concept in chemistry?

measurement system: Amount of substance: mole. The mole is defined as the amount of substance containing the same number of chemical units (atoms, molecules, ions, electrons, or other specified entities or groups of entities) as exactly 12 grams of carbon-12.

How to calculate moles.?

To calculate the moles of solute you will need to divide the weight in grams you have added to the solution by the weight in grams of one mole. For this example, use sodium chloride: NaCl. The weight of one mole, rounded to the nearest tenth, is the atomic weight of sodium, 23g, plus the atomic weight of chorine, 35.5.

## What is mole theory?

The Mole Theory. If Boies were a closet sympathizer of free enterprise and other Republican causes, the famed Yale Law School grad would want Microsoft to win its monumental antitrust battle. Of course, he seems to have done just the opposite, by making mincemeat of Bill Gates and other executives in cross-examination.