Answer to Question #173063 in Chemistry for Jeremy

Question

Lesson 12. Questions 1 to 7—convert the following number of particles to number of moles:

a. 6.022 x 10²³ molecules of water

1. 3.011 x 10²⁴ atoms of iron
2. 6.022 x 10²⁰ Mg⁺² ions
3. 4.5165 x 10²³ molecules of CuSO₄
4. Avogadro's number of H atoms
5. 2.1077 x 10²⁴ molecules of CuSO₄
6. 4.5165 x 10¹⁹ NO₃^-1ions.

Answer 1

One mole contains 6.022 x 10²³ elementary entities.

a) 6.022 x 10²³ molecules of water = 1 mole of water

1. 3.011 x 10²⁴ atoms of iron = 5 moles of iron atoms
2. 6.022 x 10²⁰ Mg⁺² ions = 1000 moles of Mg⁺² ions
3. 4.5165 x 10²³ molecules of CuSO₄ = 1.333 moles of CuSO₄ molecules
4. Avogadro's number of H atoms = 6.022 x 10²³ of H atoms
5. 2.1077 x 10²⁴ molecules of CuSO₄ = 28.571 moles of CuSO₄ molecules
6. 4.5165 x 10¹⁹ NO₃^-1 ions = 13 333.333 moles of NO₃^-1 ions.