Question

3.79 x 10^6 molecules of potassium sulfide to moles.

a) 3.79 x 10^6 moles
b) 3.79 moles
c) 3.79 x 10^6/6.022 x 10^23 moles
d) 3.79 x 10^-6 moles

Answer 1

To find the number of moles from molecules of potassium sulfide, divide 3.79 x 10^6 by Avogadro's number, yielding 3.79 x 10^6 / 6.022 x 10^23 moles.

Step-by-step explanation:

To convert molecules of potassium sulfide to moles, we use Avogadro's number, which is 6.022 × 1023 molecules/mol. First, divide the number of molecules by Avogadro's number to find the number of moles:

Number of moles = 3.79 × 106 molecules / (6.022 × 1023 molecules/mol)

This calculation yields the answer:

Number of moles = 3.79 × 106 / 6.022 × 1023 moles

So, the correct answer is c) 3.79 × 106 / 6.022 × 1023 moles.