Finding the number of moles

Presentation

•

Chemistry

•

10th - 12th Grade

•

Medium

•

NGSS

HS-PS1-7, HS-PS1-1

Standards-aligned

Ana Rodriguez

Used 8+ times

FREE Resource

5 Slides • 6 Questions

Finding the number of moles

Open Ended

Find the gram formula mass of KBr?

Type response here

Multiple Choice

How many units are present in a dozen?

Multiple Choice

Use google to determine how many units are represented in a ream.

100

500

1000

A mole represents units in chemistry

the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. A mole is a unit of measurement just like a dozen or a ream. It means 6.02 x 10^23 unit

Steps to finding the number of moles

Step 1: Find the gram formula mass (either calculate or obtain from the problem) Step

2: Label the knowns provided by the problem (including the gram formula mass)

Step 3: Determine the unknown

Step 4: Substitute

Step 5: Solve

Example #1

What is the mass of 3 moles of potassium nitrate [KNO3]? (gram formula mass = 101 g/mol)
mole = 3 moles (we know this because its unit is moles.
gram formula mass (gfm) = 101 g/mol
unknown = mass
Substitute and Solve:

Multiple Choice

How many moles are in 270. g of dinitrogen pentoxide [N2O5]? (gram formula mass = 108 g/mol)

What is the number of moles?

270

108

unknown

Multiple Choice

How many moles are in 270. g of dinitrogen pentoxide [N2O5]? (gram formula mass = 108 g/mol)

What is the gram formula mass?

270

108

unknown

Multiple Choice

How many moles are in 270. g of dinitrogen pentoxide [N2O5]? (gram formula mass = 108 g/mol)

What it the unknown?

mass

moles

gram formula mass (gfm)

Example #2

How many moles are in 270. g of dinitrogen pentoxide [N2O5]? (gram formula mass = 108 g/mol)?
gram formula mass = 108
mass = 270
unknown = moles

Finding the number of moles

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