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svet-max [94.6K]
3 years ago
13

Several billion years ago, which gas was the least prevalent in the atmosphere?

Chemistry
1 answer:
Amiraneli [1.4K]3 years ago
7 0
The least prevalent gas in the atmosphere was oxygen several billion years ago. This is because it was only around 2.4-3 billion years ago when the first photosynthetic bacteria evolved, meaning they produce food from inorganic compounds such as carbon dioxide and water to produce glucose and oxygen. Oxygen is then released in the atmosphere and this is called <em>The Great Oxygenation Event</em>. 
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Answer:

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Explanation:

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Answer:

Explanation:

Given parameters:

number of moles magnesium = 6.80mol

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To find the complete chemical formula, we should obtain the formula of the compound.

                                Mg                            Cl

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moles                      6.8                           13.56

Dividing

by the smallest      6.8/6.8                    13.56/6.8

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<em>So, the right choice is: A) 0 °C, because it is the melting point of ice. </em>

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