How many atom are their in 20g ca,co3
Answers
Answer:
You can find the answer to this by using Avagadro’s number, which is 6.022x10 to the 23rd power, which is the number of atoms that have a gram weight equal to the atomic mass.
For example, in one mole of Argon, there are 6.022x10 to the 23rd atoms.
Now, for finding the number of atoms in 20g in CaCO3, you first have to find what 1 mole of that is. To do that, you add up the atomic masses of each element.
Ca= 40.08AMU= 40g
C= 12.01AMU= 12g
O3= 16AMU= 16g, and then times 3 for the subscript, so 48g.
The total comes out to 100g, which we now know is equal to 1 mole of CaCO3. We have 20g of CaCO3, though, not 100g, so the answer is not 6.022x10 to the 23rd.
To find the answer, you need to find out what percent 20g is out of 100g. This is fairly simple, since the percentage for any number out of 100 will be that number, and in this case, that means 20g= 20%.
The final step is finding 20% of 6.022x10 to the 23rd. In order to do so, you multiply Avagadro’s number by .20, which give you an answer of 1.2044x10 to the 23rd atoms. Hope this helped you some!
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