Mole Conversions and Calculations

This video tutorial explains how to convert atoms to moles using Avogadro's number (6.02 x 10^23 atoms per mole). It uses relatable examples like dozens of cookies to simplify the concept. The tutorial includes three examples: converting sulfur, sodium, and oxygen atoms to moles. It emphasizes the importance of using the exponent button on calculators for accurate calculations. The video concludes by highlighting that no mass calculations were involved and introduces the next tutorial, which will combine gram-mole and mole-atom problems.

What is the value of Avogadro's number used for converting atoms to moles?

• 3.02 times 10 to the 23rd

• 9.02 times 10 to the 23rd

• 12.02 times 10 to the 23rd

• 6.02 times 10 to the 23rd

How many items are there in a dozen?

• 24

• 12

• 10

• 6

If you have 3.0 times 10 to the 21 atoms of sulfur, how many moles do you have?

• 1.5 moles

• 2.99 times 10 to the negative seventh moles

• 3.65 moles

• 4.98 times 10 to the negative third moles

What is the first step in converting atoms to moles?

• Subtract Avogadro's number

• Multiply by Avogadro's number

• Divide by Avogadro's number

• Add Avogadro's number

How many moles are there in 2.2 times 10 to the 24 atoms of sodium?

• 0.0365 moles

• 36.5 moles

• 3.65 moles

• 0.36 moles

Why do atoms cancel out in the conversion process?

• Because they are not needed

• To simplify the equation

• Because they are too small

• Due to unit conversion

What is the result of dividing 1.8 times 10 to the 17 atoms of oxygen by Avogadro's number?

• 2.99 times 10 to the negative seventh moles

• 4.98 times 10 to the negative third moles

• 1.8 moles

• 3.65 moles

Why is it important to use the exponent button on a calculator during these conversions?

• To save time

• To make calculations easier

• To ensure accuracy

• To avoid errors

What is the significance of not using masses from the periodic table in these problems?

• Periodic table is not needed

• Masses are irrelevant

• The focus is on numerical values

• Masses are too complex

What will the next tutorial focus on?

• Advanced atom conversions

• Linking gram-mole problems with mole-atom problems

• Chemical reactions

• Periodic table usage