Question

Determine the number of molecules in 7.5 x 10^19 particles of Fe2O3.

(a) 1.25 x 10^24
(b) 2.5 x 10^24
(c) 3.75 x 10^24
(d) 5 x 10^24.

Answer 1

To determine the number of molecules in 7.5 x 10^19 particles of Fe2O3, convert the given number of particles to moles using Avogadro's number. Then, calculate the number of molecules using the mole-to-molecule conversion factor.

Step-by-step explanation:

To determine the number of molecules in 7.5 x 10^19 particles of Fe2O3, we need to convert the given number of particles to moles and then calculate the number of molecules.

1. First, calculate the number of moles of Fe2O3:

7.5 x 10^19 particles / Avogadro's number = 7.5 x 10^19 / 6.022 x 10^23 = 1.244 x 10^-4 moles

2. The number of molecules can be calculated using Avogadro's number:

1.244 x 10^-4 moles x 6.022 x 10^23 molecules/mol = 7.50 x 10^19 molecules

Therefore, the number of molecules in 7.5 x 10^19 particles of Fe2O3 is 7.50 x 10^19.