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hichkok12 [17]
3 years ago
6

How many carbon atoms are there in a 2.8-carat diamond? diamonds are a form of pure carbon. (1 carat = 0.20 grams)\?

Chemistry
2 answers:
sukhopar [10]3 years ago
4 0
<span>2.8 carat C x (0.20g C/ 1 carat C) x (1 mole C/ 12.01 g C) x (6.02 x 10^23 atoms C/ 1 mole C) = 2.8 x 10^9 atoms C
       
Use factor label method in order to determine the amount of atoms, make sure the units cancel.</span>
dmitriy555 [2]3 years ago
4 0

First let us calculate the mass of diamond (pure Carbon).

mass = 2.8 carat * (0.20 grams / carat)

mass = 0.56 grams

 

The molar mass of Carbon is 12 g / mol and the Avogadros number is 6.022 x 10^23 atoms / mol, therefore:

Carbon atoms = 0.56 grams * (1 mol / 12 g) * (6.022 x 10^23 atoms / mol)

Carbon atoms = 2.81 x 10^22 atoms

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A chemist prepares a solution of copper(II) fluoride by measuring out of copper(II) fluoride into a volumetric flask and filling
Simora [160]

The question is incomplete, here is the complete question.

A chemist prepares a solution of copper(II) fluoride by measuring out 0.0498 g of copper(II) fluoride into a 100.0mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in mol/L of the chemist's copper(II) fluoride solution. Round your answer to 3 significant digits.

<u>Answer:</u> The concentration of copper fluoride in the solution is 4.90\times 10^{-3}mol/L

<u>Explanation:</u>

To calculate the molarity of solute, we use the equation:

\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}

We are given:

Given mass of copper (II) fluoride = 0.0498 g

Molar mass of copper (II) fluoride = 101.54 g/mol

Volume of solution = 100.0 mL

Putting values in above equation, we get:

\text{Molarity of copper (II) fluoride)=\frac{0.0498\times 1000}{101.54\times 100.0}\\\\\text{Molarity of copper (II) fluoride}=4.90\times 10^{-3}mol/L

Hence, the concentration of copper fluoride in the solution is 4.90\times 10^{-3}mol/L

4 0
3 years ago
What % of all the atoms in the universe are hydrogen
irga5000 [103]

Answer:

Over ninety percent of all the atoms in the Universe are hydrogen atoms.

Explanation:

Over ninety percent of all the atoms in the Universe are hydrogen atoms. By mass, hydrogen makes up about 75% of all matter in the Universe. Hydrogen atoms are also the smallest and lightest of all the atoms with only one electron and one proton in a common single hydrogen atom (called protium).

5 0
4 years ago
The bond angle for methane is the angle determined by two consecutive hydrogen atoms and the central carbon atom.
snow_tiger [21]

Answer:

a. True

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The bond angle for methane is the angle determined by two consecutive hydrogen atoms and the central carbon atom.

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                    H  -   C   -  H

                              |

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The bond angle is the angle between the H-C-H atoms and is 109.5degrees.

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olchik [2.2K]

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