Question

Calculate the number of moles of each substance.

a. 5.45 x 1026 molecules of methane, CHA
b. 3.22 x 1023 atoms of xenon, Xe
c. 9.6 x 1023 formula units of sodium chloride, NaCl

Answer 1

To calculate the number of moles for various substances, divide the number of molecules, atoms, or formula units by Avogadro's number (6.022 \u00d7 1023 particles per mole). Methane has 905 moles, xenon has 0.535 moles, and sodium chloride has 1.59 moles.

Step-by-step explanation:

To calculate the number of moles of each substance, we use Avogadro's number, which is 6.022 \u00d7 1023 particles (molecules, formula units, or atoms) per mole.

• a. Methane (CH4): To find the number of moles of methane, divide the number of molecules by Avogadro's number:
  Number of moles = 5.45 \u00d7 1026 molecules / 6.022 \u00d7 1023 molecules/mol = 905 moles of methane.
• b. Xenon (Xe): Similarly, divide the number of atoms of xenon by Avogadro's number:
  Number of moles = 3.22 \u00d7 1023 atoms / 6.022 \u00d7 1023 atoms/mol = 0.535 moles of xenon.
• c. Sodium chloride (NaCl): Again, divide the number of formula units by Avogadro's number:
  Number of moles = 9.6 \u00d7 1023 formula units / 6.022 \u00d7 1023 formula units/mol = 1.59 moles of sodium chloride.

Answer 2

ANSWERS:

A: there are 905.1 moles of methane.
B: there are 0.535 moles of xenon.
C: there are 1.594 moles of sodium chloride.


Explanation :

a. To calculate the number of moles of methane, CH4, we need to use Avogadro's number, which is 6.022 x 10^23 molecules per mole.

So, 5.45 x 10^26 molecules of methane would be:

5.45 x 10^26 molecules / 6.022 x 10^23 molecules/mol = 905.1 mol

Therefore, there are 905.1 moles of methane.



b. To calculate the number of moles of xenon, Xe, we need to use Avogadro's number again, but this time for atoms. There are 6.022 x 10^23 atoms per mole.

So, 3.22 x 10^23 atoms of xenon would be:

3.22 x 10^23 atoms / 6.022 x 10^23 atoms/mol = 0.535 mol

Therefore, there are 0.535 moles of xenon.



c. To calculate the number of moles of sodium chloride, NaCl, we again need to use Avogadro's number, but this time for formula units. There are 6.022 x 10^23 formula units per mole.

So, 9.6 x 10^23 formula units of sodium chloride would be:

9.6 x 10^23 formula units / 6.022 x 10^23 formula units/mol = 1.594 mol

Therefore, there are 1.594 moles of sodium chloride.


HOPE THIS HELPS!!!