3 years ago

Early historical models of the solar system were geocentric. Which of these phrases describes a geocentric solar system?

Chemistry

2 answers:

Leona [35]3 years ago

7 0

I believe the answer is A

likoan [24]3 years ago

3 0

Answer:

Explanation:

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A scientist discovers that an atom with a mass number of 14 contains eight electrons.

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How can I calculate the mass percent of carbon, nitrogen and oxygen in caffeine, C8H10N4O2.

Ahat [919]

You must first calculate the total weight of 1 mole of the substance. You do this by finding the molar weights on the periodic table of each of the elements in the compound:

$8(12.01g)+10(1.008g)+4(14.007g)+2(15.999g)=96.08g+10.08g+56.028g+31.998g=194.186g$

So now we take the amount of each element that is given in the compound and divide it by the total mass of the compound:

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Nitrogen: 56.028g

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Nitrogen = 28.85%

Oxygen: 31.998g

$\frac{31.998g}{194.186g} =0.16478=16.48$

Oxygen = 16.48%

8 0

3 years ago

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