How to derive and define 1 mole?
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Calculate the number of moles of each species, then remember that 1 mole of anything =6.022×1023 = 6.022 × 10 23 species. Therefore, 20.0 g H2O represents the least number of molecules since it has the least number of moles.
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Explanation:
A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions, etc.) as the number of atoms in a sample of pure 12C weighing exactly 12 g ..
The number of moles of a substance in a sample is obtained by dividing the mass of the sample by the molar mass of the compound. For example, 100 g of water is about 5.551 mol of water.
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