Question

Mole conversions. Complete the following conversions using dimensional analysis

1. 320,000.05 atoms of Ar is equal to how many moles of Ar?

2. 2.2 moles of CH4 is equal to how many molecules of CH4?

3. 125 mles of CH4 has how many moles of H atoms?

4. What is the mass of 125 moles of CH4?

5. What is the mass of 6 moles of Ar?

6. What is the mass of 6 atoms of Ar?

7. What is the mass of 6.07x10^34 atoms of Ar?

8. 126g of C6H6 is equal to how many moles of C6H6?

9. 334g of sulfuric acid is equal to how many moles of sulfuric acid?

10. 129g of the strong base, sodium hydroxide, will have how many moles of H atoms?

Please lay out every step to help me better understand these solution, and could you also type out your response to help me read them legibly. Thank you so very much!!!

Answer 1

1.) 320,000.05 atoms of Ar is equal to how many moles of Ar?

1 mol ---------------------> 6.023 x 10^23 atoms

x mol ----------------------> 320000.05 atoms

x = moles = 5.31 x10^-19

2. ) 2.2 moles of CH4 is equal to how many molecules of CH4?

2.2 moles of CH4 --------------------> 2.2 x 6.023 x 10^23 molecules

                          ----------------------> 1.32 x 10^24 molecules

3.) 125 mles of CH4 has how many moles of H atoms?

125 moles ----------------------------> 125 x 6.023 x 10^23 molecules

               -------------------------------> 7.53 x 10^25 molecules

number of H atoms = 7.53 x 10^25 x 4

                             = 3.01 x 10^26

4.) What is the mass of 125 moles of CH4?

   mass = moles x molar mass

            = 125 x 16

            = 2000 g

5. What is the mass of 6 moles of Ar?

mass = 6 x 40 = 240 g