How many particles are present in 12.47 grams of NaCl

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023 * 10²³ particles per mole. The Avogadro number applies to any substance.

So, first of all you must know the amount of moles that represent 12.47 grams of NaCl. For that it is necessary to know the molar mass.

You know:

Na: 23 g/mole
Cl: 35.45 g/mole

So the molar mass of NaCl is: 23 g/mole + 35.45 g/mole= 58.45 g/mole

Now you apply a rule of three as follows: if 58.45 grams are present in 1 mole of NaCl, 12.47 grams in how many moles will they be?

[tex]moles=\frac{12.47 grams*1 mole}{58.45 grams}[/tex]

moles= 0.21

You apply a rule of three again, knowing Avogadro's number: if in 1 mole of NaCl there are 6,023 * 10²³ particles, in 0.21 moles how many particles are there?

[tex]number of particles=\frac{0.21 moles*6.023*10^{23} }{1 mole}[/tex]

number of particles= 1.26*10²³

1.26*10²³ particles are present in 12.47 grams of NaCl

throwdolbeau throwdolbeau · Answer 2 · 2022-04-02T10:32:56+02:00

1.26*10²³ particles are present in 12.47 grams of NaCl. It can be calculated using Avogadro's number and the number of moles.

What is Avogadro's Number?

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance.

Its value is 6.023 * 10²³ particles per mole. The Avogadro number applies to any substance.

The Calculation for number of moles:

Molar mass of NaCl = 58.45 g/mol

Given mass of NaCl = 12.47 grams

Number of moles= given mass / Molar mass

Number of moles= 0.21 moles

Number of particles = [tex]6.022*10^{23}*0.21 = 1.26*10^{23}[/tex] particles of NaCl.

Thus, 1.26*10²³ particles are present in 12.47 grams of NaCl.

Find more information about Avogadro's number here:

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