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charle [14.2K]
2 years ago
8

How many moles of oxygen are contained in. 752 moles of calcium carbonate?

Chemistry
1 answer:
Nitella [24]2 years ago
4 0

Answer:

2.256 moles of oxygen atoms

Explanation:

CaCo3  is calcium carbonate

  every mole of calc carb has 3 moles of O atoms

  .752 moles of this has 3 times as many moles of Oxygen atoms

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What is he empirical formula for the compound that is of 1.85 moles of nitrogen and 4.63 miles of oxygen
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The empirical formula is N₂O₅.

The empirical formula is the <em>simplest whole-number ratio of atoms</em> in a compound.  

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I like to summarize the calculations in a table.  

<u>Element</u> <u>Moles</u>  <u>Ratio¹ </u>  <u> ×2²  </u>  <u>Integers</u>³

     N        1.85    1             2             2

     O        4.63    2.503   5.005     5

¹To get the molar ratio, you divide each number of moles by the smallest number (1.85).

²Multiply these values by a number (2) that makes the numbers in the ratio close to integers.

³Round off the number in the ratio to integers (2 and 5).

The empirical formula is N₂O₅.

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