Mole Conversions Review

Mole Conversions

Balancing Chemical Equations

• Follow the Law of Conservation

• Change the Coefficient not the Subscript

• Total Reactants = Total Products

Multiple Choice

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes
• no

Multiple Choice

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Poll

What is your confidence in balancing?

• 4 - ready for the quiz

• 3 - need to review

• 2 - need to practice

• 1 - send help pls

Multiple Choice

The mass of one mole of substance is called...

• molecular mass

• mole constant

• molar mass

• atomic weight

Calculating Molar Mass

• Observe the formula

• Determine the mass of each element in the formula

• Multiply the mass by the subscript for each element

• Add them all up!

Multiple Choice

What is the molar mass of carbon dioxide?

• 12.40 g/mol

• 16.55 g/mol

• 32.21 g/mol

• 44.01 g/mol

Multiple Choice

What is the molar mass of Ca(NO₃)₂?

• 148.096 g

• 164.086 g

• 102.055 g

• 70.084 g

Multiple Choice

Which compound has the smallest molar mass?

• CO

• CO₂

• H₂O

• H₂O₂

Poll

What is your confidence in calculating molar mass?

• 4 - ready for the quiz

• 3 - need to review

• 2 - need to practice

• 1 - send help pls

Mole - Mass Conversions

• Need Molar Mass

• Grams to Moles - divide

• Moles to Grams - multiply!

Multiple Choice

How many moles are in 74 g of KCl

• 0.99 mole

• 0.014 mole

• 11 moles

• 0.14 mole

Multiple Choice

Determine how many grams are in 0.36 moles of CCl₄.

• 150 g

• 55 g

• 0.0023 g

• 2.2 g

Multiple Choice

If you want 1.55 moles of nitrogen trichloride (NCl₃), how many grams should you measure out?

• 0.0129 g

• 120. g

• 187 g

• 9.33 g

Poll

What is your confidence in mole-mass conversions?

• 4 - ready for the quiz

• 3 - need to review

• 2 - need to practice

• 1 - send help pls

Multiple Choice

Avogadro’s number is:

• 6.02 x 10²²

• 6

• 6.02 x 10²³

• 3.01 x 10²³

Mole - Particle Conversions

• Particle = atom, molecule, ion

• Need Avogadro's Number (6.022x10²³)

• Particles to Moles - divide

• Moles to Particles - multiply!

Multiple Choice

How many moles of methane (CH₄) are in 1.24 x 10²³ molecules of methane?

• 6.02 x 10²³ moles

• 7.46 x 10⁴⁶ moles

• 978 moles

• 0.206 moles

Multiple Choice

How many water molecules are in 5.2 moles of water?

• 6.0 x 10²³ molecules

• 5.2 molecules

• 3.1 x 10²⁴ molecules

• 8.6 x 10^-24 molecules

Multiple Choice

Determine the number of moles in 5.2 x 10²² atoms of gold.

• 0.086 mole

• 0.52 mole

• 8.63 x 10⁴⁴ moles

• 3.1 x 10⁴⁶ moles

Poll

What is your confidence in mole-particle conversions?

• 4 - ready for the quiz

• 3 - need to review

• 2 - need to practice

• 1 - send help pls

Poll

What grade do you expect to get on the quiz?

• A+

• A

• A-

• B+