Who introduced the term mole Class 9?

What is meant by term mole Class 9?

A mole can be defined as the amount of substance that contains the same number of chemical entities (atoms, ions, molecules, etc.)

What is mole in body?

Moles occur when cells in your skin grow in a cluster instead of being spread throughout the skin. Most moles are made of cells called melanocytes, which make the pigment that gives your skin its natural color.

Why is mole concept important?

Explanation: THE mole is important because it allows chemist to work with a subatomic world with macro world units and amount. Atoms molecules and formula units are very small and very difficult to work with usually. However the mole allows a chemist to work with amount large enough to use.

When was mole concept introduced?

What is the origin of the mole concept? The term “molar” (from the Latin moles, meaning “a large mass”) was first introduced into chemistry by the German chemist, August Wilhelm Hofmann (1818–1892), around 1865 (1).

What is the formula of mole?

Avogadro’s number is a very important relationship to remember: 1 mole = 6.022×1023 6.022 × 10 23 atoms, molecules, protons, etc. To convert from moles to atoms, multiply the molar amount by Avogadro’s number. To convert from atoms to moles, divide the atom amount by Avogadro’s number (or multiply by its reciprocal).

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How do you find a mole of Class 9?

Mole concept

  1. If we weigh an element equal to its atomic mass in grams,then it contains 6.022×1023 atoms of the element. …
  2. No. …
  3. This number is called as AVOGADRO’S CONSTANT.
  4. 1 mole of atom=6.022×1023atoms.
  5. 1 mole of molecules=6.022×1023molecules.
  6. Mole of atoms.

Which moles are lucky for female?

Those females with a mole in between their eyebrows will be very lucky and fortunate. They are endowed with the wisdom to act rightly. They will be wealthy too. If there is a mole on the right or left eyebrow, those females will make a lot of money.

What does mole on breast mean?

Any New Moles Including a Change to an Existing Mole

Moles are often reported as an early indicator of breast cancer. Studies have shown that women who had ‘very many’ moles had a 13% higher risk of contracting breast cancer than women who had no moles.

What does mole on private parts mean?

While a mole on the right butt indicates creative freedom, wisdom and will mostly be an artist. Moles around the genital. A mole present on any part of a person’s genital indicates that they have excessive desire for sex and may have illict relationships in their lifetime.