Question

How many moles is 4.10 x 10²⁵ molecules of PCl3?

Answer 1

To find the number of moles of PCl3 when given the number of molecules, divide the number of molecules by Avogadro's number, which results in approximately 6.810 x 10^2 moles of PCl3.

Step-by-step explanation:

The question asks about converting a given number of PCl3 molecules into moles. The key to solving this problem is using Avogadro's number, which is 6.022 x 1023 molecules per mole, as a conversion factor. Here's how you can do the calculation:

1. Write down the number of molecules given: 4.10 x 1025 molecules of PCl3.
2. Use Avogadro's number as a conversion factor to get moles from molecules. The conversion factor is 1 mole / 6.022 x 1023 molecules.
3. Divide the given number of molecules by Avogadro's number to find the number of moles:

Number of moles = 4.10 x 1025 molecules / 6.022 x 1023 molecules per mole

Number of moles = 4.10 / 6.022 x 102

Number of moles = 6.810 x 102 moles PCl3