find the number of particles of H20 in 1.25 mole of H20
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Answer: A mole, also spelled as mol, is a unit most commonly used in chemistry. Just as one dozen is equal to 12, one mol is equal to 6.022140857∗
6.022140857
∗
10^23. This might at-first seem like a random large number, but in-fact this is the approximate amount of carbon-12 atoms found in 12 grams of carbon-12. One mol is also known as the Avogadro constant - Wikipedia. Carbon-12 was chosen because we needed to choose a unit. Carbon seems to be a good element because it is not to heavy, and abundant.
Fun Fact: While this number was named Avogadro’s constant, he was not the first to discover the number.
From Joanjoc [Public domain], via Wikimedia Commons
If we have 1.25 moles of water, how many atoms are there? Rounding the number to 6.02 * 10^23, we can say there are 2.2575*10^24 atoms in 1.25 mol of water.
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