Mole Conversion Mastery Challenges

This video provides practice problems for mole conversions, focusing on calculating molecules, grams, and atoms in various compounds. It covers four problems: determining molecules in H2SO4, grams in C4H8, grams in Al2O3, and fluorine atoms in CaF2. The video emphasizes the use of Avogadro's number, molar mass, and significant figures in calculations, offering a step-by-step approach to solving each problem.

What should you be comfortable with before watching this video?

• Balancing chemical equations

• The history of Avogadro's number

• The concept and definition of a mole

• The periodic table

What is the first step in converting 8.352 moles of H2SO4 to molecules?

• Dividing by Avogadro's number

• Finding the molar mass

• Balancing the chemical equation

• Multiplying by Avogadro's number

How many significant figures should be used in the final answer for the first problem?

• Four

• Three

• Five

• Two

What is the molar mass of C4H8 used in the second problem?

• 56.108 g/mol

• 78.074 g/mol

• 44.096 g/mol

• 32.042 g/mol

What is the final answer for the mass of 7 moles of C4H8, considering significant figures?

• 392.756 grams

• 400 grams

• 392 grams

• 390 grams

What is the first step in converting 3.26 x 10^25 molecules of Al2O3 to grams?

• Balancing the chemical equation

• Finding the molar mass

• Dividing by Avogadro's number

• Multiplying by Avogadro's number

What is the molar mass of Al2O3 used in the third problem?

• 56.108 g/mol

• 78.074 g/mol

• 101.96 g/mol

• 50.98 g/mol

What is the final mass of Al2O3 in grams, considering significant figures?

• 5500 grams

• 5521.48 grams

• 5510 grams

• 5520 grams

What is the molar mass of CaF2 used in the fourth problem?

• 50.98 g/mol

• 78.074 g/mol

• 56.108 g/mol

• 101.96 g/mol

How many fluorine atoms are there in 90.25 grams of CaF2?

• 1.20 x 10^24

• 3.02 x 10^24

• 6.95 x 10^23

• 1.40 x 10^24