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kicyunya [14]
2 years ago
6

Sodium is an alkali metal that reacts violently with water. Calculate the total number of atoms in a 58.2 grams sample of sodium

and express in correct scientific notation.
Chemistry
1 answer:
Evgesh-ka [11]2 years ago
4 0

In 58.2 grams of Na there is 1.51 x 10^24 atoms.

<h3>Mole calculation</h3>

To calculate the amount of atoms present in a mass sample, it is necessary to have knowledge of the molar mass of the element and Avogadro's constant, used in such a way that:

MM_Na= 23g/mol

C = 6\times 10^{23}

                                       MM = \frac{m}{mol}

                                    23 = \frac{58.2}{x} = > 2.53 atoms

Now, with the value of the number of moles, just calculate the number of atoms present, so that:

                                       atoms = mol \times C

                                     atoms = 2.53 \times 6 \times 10^{23}

                                        atoms = 1.51 \times 10^{24}

So, in 58.2 grams of Na there is 1.51 x 10^24 atoms.

Learn more about mole calculation in: brainly.com/question/2845237

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Calculate the hydroxide ion consentration of a solution with pH = 3.25. show all calculations leading to your answer.
lidiya [134]
First you calculate the pOH of the solution:

pH+ pOH = 14

3.25 + pOH = 14

pOH = 14 - 3.25

pOH = 10.75

<span>Concentration of [OH]</span>⁻<span> in solution:
</span>
[ OH⁻ ] = 10 ^{-pOH}

[ OH⁻ ]  = 10^ - 10.75

[OH⁻] = 1.778 x 10⁻¹¹ M

hope this helps !


6 0
3 years ago
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Answer: Option (b) is the correct answer.

Explanation:

A covalent compound is defined as the compound in which sharing of electrons take place between the combining atoms. Generally, when two or more non-metals chemically combine together the it will lead to the formation of a covalent compound.

For example, C_{6}H_{12}O_{6} and HCl is also a covalent compound.

And, a compound in which transfer of electrons occur between the combining atoms is known as an ionic compound. Whenever, a metal chemically combines with a non-metal then it will always lead to the formation of an ionic compound.

For example, KI is an ionic compound.

Thus, we can conclude that C_{6}H_{12}O_{6} and HCl are the two substances which are covalent compounds.

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