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Softa [21]
3 years ago
5

What number would you write before water in the formula for calcium carbonate hexahydrate?  4 5 6 7

Chemistry
1 answer:
serious [3.7K]3 years ago
7 0
Calcium Carbonate Hexahydrate
(Ca C O3 6H20)

The number you would write before water in the formula for calcium carbonate hexahydrate would be 6.


Facts about Calcium Carbonate Hexahydrate:
<span>This compound often crystallises when Essex river waters are softened by the lime/soda process. Formation of the hydrated salt is favoured by low water temperatures and by high orthophosphate levels. Calcium carbonate hexahydrate forms pure well-defined crystals which are considerably more soluble in water than calcite, the usual product of lime/soda softening. </span>
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Analysis of a rock sample shows that it contains 6.25% of its original uranium-235. How old is the rock? How do you know?
nadya68 [22]

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A radioactive isotope is an isotope that undergoes nuclear decay, breaking apart into a smaller nucleus and emitting radiation during the process.

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For a radioactive isotope, the amount of substance left after a certain time t is:

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Substituting into (1) and solving for t, we can find how much time has passed:

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