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Unit: Chemical Quantities
“The Mole – 1 step” – Wksh #1

Directions: Make the following mole conversions using dimensional analysis. Be sure to show all of your work, include your units, and box your final answer.

1. How many moles are equal to 1.20 x 1024 atoms of sulfur?
1.99 mol






2. How many atoms are equal to 1.5 moles of helium?








3. How many moles are equal to 4.15 x 1023 molecules of carbon monoxide?








4. How many molecules are equal to 2.25 moles of sulfur dioxide?








5. How many moles are equal to 2.4 x 1023 formula units of sodium chloride?



6. How many formula units are equal to 1.8 moles of magnesium iodide?









7. How many moles are equal to 3.67 x 1023 formula units of potassium permanganate?









8. How many molecules of carbon tetrachloride are equal to 0.25 moles?









9. How many moles are equal to 1.3 x 1024 atoms of aluminum?









10. How many molecules are equal to 3.52 moles of oxygen difluoride?

Respuesta :

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The Avogadro's number can be used to calculate the number of molecules.

Let us recall that one mole of a substance is equal to the Avogadro's number of elementary entities. This will be applied in solving the following questions.

1) 1 mole of sulfur atoms contains 6.02 x 10^23 atoms

x moles of sulfur contains 1.20 x 10^24 atoms

x = 1 mole x  1.20 x 10^24 atoms /6.02 x 10^23 atoms

x = 1.99 moles

2) 1 mole of helium atoms contains 6.02 x 10^23 atoms

1.5 moles of helium atoms contains  1.5 moles x  6.02 x 10^23 atoms/ 1 mole

= 9.03  x 10^23 atoms

3) 1 mole of carbon monoxide contains  6.02 x 10^23 molecules

x moles of carbon monoxide contains 4.15 x 10^23 molecules

x =  1 mole x 4.15 x 10^23/6.02 x 10^23

x = 0.69 moles

4) 1 mole of sulfur dioxide contains  6.02 x 10^23 molecules

2.25 moles of sulfur dioxide contains  2.25 moles x 6.02 x 10^23 molecules/ 1 mole = 1.35  x 10^24

5)  1 mole of sodium chloride contains 6.02 x 10^23 formula units

x moles of sodium chloride contains  2.4 x 10^23 formula units

x =  1 mole x  2.4 x 10^23 formula units/6.02 x 10^23 formula units

x = 0.40 moles

6) 1 mole of magnesium iodide  contains 6.02 x 10^23 formula units

1.8 moles of magnesium iodide  contains 1.8 moles  x  6.02 x 10^23 formula units/1 mole  

= 1.08  x 10^24

7) 1 mole of potassium permanganate contains 6.02 x 10^23 formula units

x moles of potassium permanganate contains 3.67 x 10^23 formula units

x = 1 mole x 3.67 x 10^23 formula units/6.02 x 10^23 formula units

x = 0.61 moles

8) 1 mole of carbon tetrachloride contains 6.02 x 10^23 molecules

0.25 moles of potassium permanganate contains 0.25 moles x 6.02 x 10^23 molecules /1 mole

x = 1.5 x 10^23 molecules

9) 1 mole of aluminium contains  6.02 x 10^23  atoms of aluminium

x moles of aluminium contains   1.3 x 10^24 atoms of aluminum

x = 1 mole x   1.3 x 10^24 atoms of aluminum/ 6.02 x 10^23  atoms of aluminium

x = 2.16 moles of aluminum

10)  1 mole of oxygen difluoride contains 6.02 x 10^23 molecules

3.52 moles of oxygen difluoride contains 3.52 moles x 6.02 x 10^23 molecules / 1 mole  

x = 2.1 x 10^24 molecules

Learn more about Avogadro's number: https://brainly.com/question/1445383

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