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lord [1]
3 years ago
12

How many carbon atoms are in 4.00g of butane

Chemistry
2 answers:
Dmitrij [34]3 years ago
5 0
1.66x10^23 atoms I hope this helps u
Svetach [21]3 years ago
5 0

Answer: 1.6221*10^23 atoms

Explanation:

Butane = C4H10

Molar mass = 58g/mol

1 mole of butane has 4 carbon atoms.

% of carbon in 1 mole of C4H10 = 4*12/58 =82.8%

Mass of carbon in 4g of butane = 82.8/100 *4 = 3.312g.

3.312g of carbon is equal to how many moles of carbon?

No.of moles = mass/ molar mass

3.312/12 = 0.276 moles.

Using Avogadro's number,

Number of atoms in any substance = Avogadro's constant * no of moles of that substance

(6.02214*10^23) * 0.276 = 1.6221*10^23 atoms.

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How many moles of helium are 8.84×1024 atoms of He?
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Answer:

14.68 moles of He

Explanation:

To do this, just remember Avogadro's Constant or Avogadro's number. This constant tells us how many units ( in this case atoms) there are in a mole of ANY type of substance.

Avogadro's constant is 6.022140857 × 10²³ units per mole.

Now that we know how many atoms there are in 1 mole, we can use this as our conversion factor.

8.84 x 10²⁴ atoms of He →  moles of He

8.84\times10^{24} atoms of He\times\dfrac{1moleofHe}{6.022140857\times10^{23}atomsofHe}=14.68molesofHe

So the answer would be:

14.68 moles of He

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3 years ago
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Answer: = C

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evaporating some of the water contained in the solution will increase the concentration of the resulting solution, because there will be concomitant increase in the number of moles of the solute left in the solution.

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Most of the carbon is put away in sedimentary carbonates and kerogens, with the rest being spread between the sea, the air, biomass, for example, plants and creatures, and petroleum products.

<u>Explanation</u>:

  • The carbon cycle is the procedure where carbon goes from the surrounding into living beings and to the Earth and then again goes into the air. Plants take carbon dioxide from the air and use it for food preparation. Creatures at that point eat the nourishment and carbon is put away in their bodies or discharged as CO2 through the breath.  
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