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atomic mass of some elements are given [mg=24,0=16. a) how many atoms are there into mg? b) find the mass of 4×6.022×10²³oxygen atoms. |
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Answer» ong>Answer: The Mole As we have observed, ATOMS are very small--too small to be weighed or counted individually. NEVERTHELESS, we often need to know how many atoms (or molecules, or electrons, and so on) a sample CONTAINS. To solve this dilemma, we use a counting UNIT called Avogadro's number, named after the ITALIAN scientist Amedeo Avogadro (1776-1856): |
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