Moles, Mass, and Particle Conversions Explained

The video tutorial covers unit conversion in chemistry, starting with basic examples like converting apples to dozens. It introduces the concept of using conversion factors and applies it to fictional units for clarity. The tutorial then delves into the mole concept, explaining how to convert between moles and atoms using Avogadro's number. It also covers the use of molar mass in conversions and concludes with Avogadro's hypothesis, explaining the relationship between gas volume and moles at standard temperature and pressure.

What is the consistent procedure used for converting units in chemistry?

• Given divided by want

• Have divided by want

• Want times have over given

• Given times want over have

If one dozen apples has an average mass of 2.0 kilograms, what is the mass of 90 apples?

• 15 kilograms

• 18 kilograms

• 20 kilograms

• 12 kilograms

In the example with made-up units, how many giggle tarts are there in 35 fu-manchu's?

• 85 giggle tarts

• 70 giggle tarts

• 80 giggle tarts

• 76 giggle tarts

How many moles are equivalent to 2.80 times 10^24 atoms of silicon?

• 2.65 moles

• 3.65 moles

• 5.65 moles

• 4.65 moles

How many atoms are in 1.14 moles of sulfur trioxide (SO3)?

• 1.75 times 10^24 atoms

• 3.75 times 10^24 atoms

• 2.75 times 10^24 atoms

• 4.75 times 10^24 atoms

What is the molar mass of C20H42?

• 282 grams

• 300 grams

• 250 grams

• 200 grams

What is the mass in grams of 0.00452 moles of C20H42?

• 1.57 grams

• 1.47 grams

• 1.37 grams

• 1.27 grams

What is the chemical formula for dinitrogen trioxide?

• N2O3

• N2O5

• NO2

• NO3

What is the volume of 3.70 moles of nitrogen gas (N2) at STP?

• 82.9 liters

• 90.9 liters

• 70.9 liters

• 60.9 liters

What is the volume in liters of 100 grams of NH3 at STP?

• 162 liters

• 142 liters

• 132 liters

• 152 liters