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kondaur [170]
2 years ago
11

Almost 99% of the Earth's atmosphere is made up of two gases. What ere the two gases and the percents of each?

Chemistry
2 answers:
Gwar [14]2 years ago
6 0

Answer:

21% oxygen and 78%nitrogen

Explanation:

Gnoma [55]2 years ago
6 0

Answer:

Nitrogen and Oxygen

Explanation:

nitrogen - 78 %

oxygen - 21%

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Explanation:

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3 years ago
What is the percent mass oxygen in calcium carbonate (CaCo3)?
Gnoma [55]
  <span>Step 1 is to determine the mass of each part 
Mass of Ca is 40.08 g 
Mass of C is 12.01 g 
Mass of O is 16.00 x 3 = 48.00 g 
Step 2 is to determine the total mass of the compound 
Total mass of CaCO3 is 40.08 + 12.01 + 48.00 = 100.09 g 

Step 3 is to determine the % of each part using the following formula: 
Mass of part / total mass x 100 = 

40.08 / 100.09 x 100 = 40.04 % Ca 

12.01 / 100.09 x 100 = 12.00 % C 

48.00 / 100.09 x 100 = 47.96 % O 

Step 4 is to double check by adding all percentages. If they equal 100, then I probably did it right. :) 
40.04 
+12.00 
+47.96 
=100.00</span><span>
</span>
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I think that it's cannot include supernatural explanations, or C.

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