Amount of substance, as a physical quantity, tells us how many particles are there in some amount of some substance. When we say that there is 1 mol of something, it means that there are 6.022*10^23 particles of that substance. That number (6.022*10^23) is called Avogadros number.
A group of two or more than two atoms of the same or different elements that are chemically bonded together is called a molecule. For example: Two atoms of hydrogen (H2) and one atom of oxygen (O2) react with each other and form one molecule of water.
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Amount of substance, as a physical quantity, tells us how many particles are there in some amount of some substance. When we say that there is 1 mol of something, it means that there are 6.022*10^23 particles of that substance. That number (6.022*10^23) is called Avogadros number.
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A group of two or more than two atoms of the same or different elements that are chemically bonded together is called a molecule. For example: Two atoms of hydrogen (H2) and one atom of oxygen (O2) react with each other and form one molecule of water.
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