Warm-Up! (Day1) Find the Molar Masses of 1. CH 4 2. Sodium Hydrogen Carbonate 3. Jelly beans if 1 jelly bean weighs 0.5 g.

Warm-Up! (Day1) • Find the Molar Masses of

1. CH4

2. Sodium Hydrogen Carbonate

3. Jelly beans if 1 jelly bean weighs 0.5 g

Mole Conversions# - mole - mass

How many molecules are in 700g of sugar?

• Hard to count tiny individual molecules

→ Count by Weighing (measuring mass is easier than counting #)

→ Convert the Mass into the Mole, and then into the # of molecules

The mole can act as a bridge

# of things

(Atoms or Molecules)

GramsMoles

Molar Mass6.02 x 1023

Fence Diagram

= what you want

• Put “1” in front of “moles”

“6.02 x 1023” in front of “atoms / molecules”

“Molar Mass” in front of “grams”

What you have Units of what you want

Units of what you have

Practice!1. How many molecules are in 0.5 moles of H2O?

2. How many moles are in 3.6 1024 atoms?

3. How many grams are in 2 moles of CO2?

4. How many moles are in 21.0 g of Sodium Bicarbonate?

Practice!5. How many formula units are present in 56.2 g of NaCl?

6. How many grams are 2.28 x 1023 molecules of NH3?

Mole Conversions 1 (Name:______ Per:__)1. How many molecules are in 6 moles of CO2?

2. How many moles are in 1.5 x 1024 Carbon atoms?

3. How many grams are in 4 moles of N2?

4. How many moles are in 4.04 g of H2?

5. How many grams are in 5.02 x 1023 CH2O molecules?

6. How many molecules are present in 453.6 g of NH4NO3 (ammonium nitrate)?