What is a mole in chemistry?

Lucy 2 answers
I don’t understand what it is and when you use it.
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Speaking in terms of chemistry, a mole is the amount of material containing 6.02214 × 10^23 particles. For example, 1 mole of hydrogen gas contains 6.02214 × 10^23 molecules of hydrogen, which in grams would be (1.000+1.000 = 2.000g). So as a formula to use Moles = Mass / Mr (molecular or atomic mass)
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Regardless of what you are, an atom or a human then one mole of you is a value of 6.022 x 10^23. Its a theory no one counted it!
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