Molar Mass and Conversion Problems

The video tutorial covers the conversion between atoms, moles, and mass using Avogadro's number and molar mass. It includes practice problems for converting copper atoms to mass and gold mass to atoms, emphasizing the importance of dimensional analysis and unit cancellation. The tutorial concludes with tips for solving conversion problems accurately.

What is Avogadro's number used for in chemistry?

• To calculate the density of a substance

• To determine the volume of a gas

• To convert between atoms and moles

• To measure the mass of an atom

How do you convert moles to mass?

• By using the volume of the substance

• By using the density of the substance

• By using the molar mass from the periodic table

• By using the atomic number

In the example problem, what is the first step to find the mass of copper atoms?

• Convert mass to volume

• Convert atoms to moles using Avogadro's number

• Convert mass to atoms directly

• Convert moles to atoms using molar mass

What is the molar mass of copper used in the example problem?

• 58.44 grams

• 63.546 grams

• 60.02 grams

• 75.32 grams

In the gold example, what is the starting point for the conversion?

• Moles of gold

• Mass of gold

• Volume of gold

• Atoms of gold

What is the molar mass of gold used in the example problem?

• 180.95 grams

• 200.59 grams

• 210.98 grams

• 196.967 grams

Why is it important to label units in conversion problems?

• To ensure units cancel correctly and follow the mole map

• To make the problem look neat

• To avoid using a calculator

• To ensure the correct chemical reaction

What should you do if your units do not cancel in a conversion problem?

• Ignore it and continue

• Start a new problem

• Recheck your setup and conversion factors

• Use a different calculator

What is a conceptual check used for in conversion problems?

• To ensure the problem setup is correct

• To check the calculator's battery

• To verify the accuracy of the periodic table

• To find a shortcut for the problem

What is the best way to become proficient in solving conversion problems?

• Watch videos without practicing

• Practice problems repeatedly

• Memorize the periodic table

• Use a calculator with shortcuts