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musickatia [10]
3 years ago
13

Almost 99% of earths atmosphere is made up of two gases. What are the two gases and the percents of each?

Chemistry
2 answers:
timofeeve [1]3 years ago
7 0
The correct answer id A i just did the test

Natali5045456 [20]3 years ago
5 0
The Answer Is A 21% oxygen and 78%nitrogen
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<u><em>Answer:</em></u>

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<u><em>Explanation</em></u>

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Do biotic factors contain cells
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3 years ago
An element has ccp packing with a face-centered cubic unit cell. its density is 8920 kg/m3 and the unit cell volume is 4.72 x 10
ziro4ka [17]
<span>63.4 g/mol
   First, let's determine how many atoms per unit cell in face-centered cubic. There is 8 corners, each of which has 1 atom, and each of those atoms is shared between 8 other unit cells. So 8*1/8 = 1 atom per unit cell. Additionally, there are 6 faces, each of which has 1 atom that's shared between 2 unit cells. So 6*1/2 = 3 atoms per unit cell. So each unit cell has the mass of 1+3 = 4 atoms. Since there is 1000 liters per cubic meter, the mass per liter is 8920 kg/1000 = 8.920 kg/L. Now the mass per unit cell is 8920 g * 4.72x10^-26 = 4.21024x10^-22 g per unit cell. The mass per atom is 4.21024x10^-22 g / 4 = 1.05256x10^-22 g/atom, Finally, multiply by Avogadro's number, getting 1.05256x10^-22 g/atom * 6.0221409x10^23 atom/mol = 63.38664625704 g/mol.
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5 0
3 years ago
In the covalent compound C3H8 the Greek prefix used to represent the cation is?
krok68 [10]

Answer:

pro

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3 carbons makes it PROpane

the ANE come from all single bonds

4 0
3 years ago
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How many nitrogen atoms are represented in 2Ca(NO3)2?
arsen [322]

Explanation:

there is 2 nitrogen but if you mean nitrate is 6

4 0
3 years ago
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