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silentlotusalex6284
08.10.2019 •
Chemistry
How many atoms make up 20.0 grams of chalk (caco3)?
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Ответ:
First, find the molar mass of CaCO3 (100.0869 grams, but you can usually look on a periodic table for a less precise number and still be fine).
Convert grams to moles, and moles to atoms
20.0 grams *
= 1.20 *
.
Check if the answer makes sense.
If you have 20 grams of chalk, you have ~20% of a mole of chalk. This means you have ~20% of the atoms a normal mole of chalk would have.
1.2 / 6.02 = 0.199, which is very close to 0.2 a.k.a. 20%
Ответ:
weird but ok
Explanation: