Molar Mass and Conversion Techniques

The video tutorial explains how to convert moles to grams using the molar mass. It introduces the mnemonic 'moles to grams, multiply by the molar mass' to help remember the process. The tutorial provides examples with water (H2O), nitrogen dioxide (NO2), and carbon dioxide (CO2), demonstrating how to find the molar mass using the periodic table and perform the conversion. The importance of unit cancellation is emphasized to ensure the correct result in grams.

What is the key mnemonic to remember when converting moles to grams?

• Grams to moles, divide by the molar mass

• Grams to moles, multiply by the molar mass

• Moles to grams, multiply by the molar mass

• Moles to grams, divide by the molar mass

How do you find the molar mass of water (H2O)?

• Multiply the atomic mass of oxygen by two

• Multiply the atomic mass of hydrogen by two

• Add the atomic masses of two hydrogens and one oxygen

• Add the atomic masses of two oxygens and one hydrogen

What is the molar mass of water (H2O) in grams per mole?

• 22.00 g/mol

• 20.00 g/mol

• 18.02 g/mol

• 16.00 g/mol

When converting 1.24 moles of NO2 to grams, what is the first step?

• Divide by the molar mass of NO2

• Multiply by the molar mass of NO2

• Subtract the atomic masses of nitrogen and oxygen

• Add the atomic masses of nitrogen and oxygen

What is the molar mass of NO2 used in the conversion example?

• 60.01 g/mol

• 46.01 g/mol

• 30.01 g/mol

• 50.01 g/mol

How many grams are there in 1.24 moles of NO2?

• 50.0 grams

• 60.0 grams

• 46.0 grams

• 57.2 grams

What is the molar mass of CO2 used in the conversion example?

• 46.01 g/mol

• 40.01 g/mol

• 48.01 g/mol

• 44.01 g/mol

How many grams are there in 2.34 moles of CO2?

• 103.0 grams

• 105.0 grams

• 100.0 grams

• 110.0 grams

Why is it important to ensure units cancel out when converting moles to grams?

• To ensure the answer is in grams

• To make the calculation faster

• To simplify the calculation

• To avoid using the periodic table

What should you do if your calculated answer has more significant figures than the given data?

• Ignore significant figures

• Round to match the least number of significant figures

• Round to the nearest whole number

• Use all the significant figures