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RoseWind [281]
3 years ago
5

Corals absorb ______ from the ocean to form their skeletons.

Chemistry
2 answers:
Nina [5.8K]3 years ago
3 0
<span>They absorb calcium ions and bicarbonate (hydrogen carbonate) ions.
Sooo B
I hope this helps! :)
</span>
saul85 [17]3 years ago
3 0

Answer: The correct option is b. Calcium

Explanation: Ocean water consists of a large amount of Chloride (Cl^-), Sulfate (SO_4^{2-}), Magnesium (Mg^{2+}), Sodium (Na^+), Calcium (Ca^{2+}) and Potassium (K^+) ions.

The coral animals absorb calcium element from the ocean to form their skeleton. Then, the calcium ions combine with carbon and oxygen to form calcite.

Hence, the correct option is b.

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9.86 x 10²⁸ O-atoms require what volume (L) N₂O₂ at STP?
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First, we use avogadro's number to convert atoms into moles. Then, relate the number of moles from elemental to the compound. Lastly, we use conditions at STP to calculate the volume. We do as follows:

<span>9.86 x 10²⁸ O-atoms ( 1 mol / 6.022x10^23 atoms O) ( 1 mol N2O2 / 2 mol O ) ( 22.4 L / 1 mol ) = 1833809.37 L needed</span>
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