Conversions

When converting between units:Draw a t-chartFill it inMultiply across and divide by the bottom

GIVEN WHAT YOU WANT

UNITS OF GIVEN

Example:12 inches in 1 footConversion Factor: 12 inches = 1 foot

Remember:1 mole = atomic mass (g)1 mole = molar mass (g)

How many moles of Na atoms are there in 46.0 g of Na?

46.0 g Nag Na

mol Na

= 2.00 mol Na

23.001

How much would 2.34 moles of carbon weigh?28.10 g C

How many moles of magnesium is 48.62 g of Mg?2.00 mol Mg

How many moles is 5.69 g of NaOH?

5.69 g NaOH

g NaOH

mol NaOH

Na = 23.00g O = 16.00 g H = 1.01 g 1 mole NaOH = 40.01 g

1

40.01= 0.14 mol

NaOH

How many moles is 4.56 g of CO2?0.10 mol CO2

How many grams is 9.87 moles of H2O?177.86 g H2O

A moles meaning doesn’t stop there!

When we weigh a mole the mass is made up of an amount particles!

This # never changes even when the identity of the atoms changes.

The # of atoms in a mole is called,Avogadro's Number = 6.022 x 1023

1 MOLE = 6.022 x 1023 particlesatoms

moleculesformula units

The mole concept allows us to count atomsmoleculesformula unitsparticles

1 MOLE = 6.022 x 1023 atoms

So how many atoms are in 3 mol of Al?

3 mol Al 6.022 x 1023

mol Al

= 1.81 x 1024 atoms of Al

1

atoms Al

How many moles are in 3.0 x 1023

atoms of Al?

3x1023 atoms of Al

6.022 x 1023 atoms of Al

1 mol Al

= 0.498 mol of Al

How many molecules is 6.8 mol of CH4?4.09x 1024 molecules CH4

4.9 x 1023 particles of C6H12O6has how many moles?

0.814 mol C6H12O6