How many moles in 2.5 x 10^24 atoms of calcium
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How many moles of calcium are there in 2.41 x 10^25 calcium atoms?
Moles always confuse people, but they shouldn’t. The easiest way to think of a mole is to compare it to a dozen. When someone says they have a dozen eggs, you know immediately that they have 12. If someone says they have a mole of calcium atoms, you know that they have 6.022 x 10^23 calcium atoms.
If I have 24 eggs, and I want to know how many dozen eggs I have, I just divide by 12, which gives me 2 dozen.
If I have 2.41 x 10^25 calcium atoms, and I want to know how many moles of calcium atoms I have, I just divide by 6.022 x 10^23, which gives me about 40 moles.
Now, what everyone wants to know is how big of an omelette could you make if you had a mole of eggs!
If the weighs 56.7 grams, and 13% of that is shell, then the inside edible part of the egg will weigh about 49 grams. If we multiply 49 grams by Avogadro’s Number, we get:
49 grams x 6.066 x 10^23 = 2.95 x 10^25 grams
7.35 x 10^25 grams.
2.95 x 10^25 grams / 7.35 x 10^25 grams = .40
So one mole of average sized chicken eggs will make an omelette with mass equal to about 40% of the moon!
So now you can remember that a mole is just like a dozen, just a lot lot lot lot bigger.
F_O_L_L_O_W me
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