Complete the following table by replacing question marks with the correct numbers: (Note: Each horizontal row is a separate example, so in row #1, 175.32 grams of NaCl is how many moles of NaCl and how many molecules of NaCl does it contain?)

Question

Complete the following table by replacing question marks with the correct numbers: (Note: Each horizontal row is a separate example, so in row #1, 175.32 grams of NaCl is how many moles of NaCl and how many molecules of NaCl does it contain?)

Grams NaCl Moles NaCl # Molecules NaCl
175.32 ? ?
? 0.333 ?
? ? 6.02x10^23

Answer 1

NaCl is 23 + 35.5 = 58.5 grams / mol

so
175.32 grams + 1 mol/58.5 grams = 3 moles of NaCl
and
3 moles * 6*10^23 molecules/mole = 1.8*10^24 molecules

Answer 2

To complete the table, we need to use the molar mass of NaCl and Avogadro's number.

First, let's determine the number of moles of NaCl for the first row:

Step 1: Find the molar mass of NaCl.
The molar mass of NaCl is the sum of the atomic masses of sodium (Na) and chlorine (Cl). The atomic mass of sodium is approximately 22.99 grams per mole, and the atomic mass of chlorine is approximately 35.45 grams per mole.
So, the molar mass of NaCl is approximately 22.99 + 35.45 = 58.44 grams per mole.

Step 2: Calculate the number of moles of NaCl.
To find the number of moles of NaCl, divide the given mass of NaCl by its molar mass.
For the first row, we divide 175.32 grams by 58.44 grams/mole.
175.32 g / 58.44 g/mol ≈ 3 moles

So, we can fill in the table for the first row:
Grams NaCl: 175.32
Moles NaCl: 3
Number of Molecules NaCl: To find the number of molecules, we need to use Avogadro's number.

Avogadro's number is approximately 6.02 x 10^23 molecules per mole.

So, the number of molecules of NaCl is:
3 moles x 6.02 x 10^23 molecules/mole ≈ 1.8076 x 10^24 molecules

Now let's move to the second row:

Grams NaCl: We don't have this information, so we leave it as a question mark.
Moles NaCl: We are given 0.333 moles of NaCl.
Number of Molecules NaCl: We don't have this information, so we leave it as a question mark.

For the second row, we have the number of moles, so we don't need to perform any calculations. Simply fill in the table:
Grams NaCl: ?
Moles NaCl: 0.333
Number of Molecules NaCl: ?

Finally, let's move to the third row:

Grams NaCl: We don't have this information, so we leave it as a question mark.
Moles NaCl: We don't have this information, so we leave it as a question mark.
Number of Molecules NaCl: We are given 6.02 x 10^23 molecules of NaCl.

For the third row, we have the number of molecules, so we don't need to perform any calculations. Simply fill in the table:
Grams NaCl: ?
Moles NaCl: ?
Number of Molecules NaCl: 6.02 x 10^23