1. FACTOR LABEL, MOLE CALCULATIONS
ex#1--CALCULATE THE NUMBER OF PARTICLES IN GRAMS OF NaOH.
4 S.F.
EQUATION METHOD:
MOLES = MASS
GFM
PARTICLES = MOLES X X 1023
MOLES = g
40.0 g/mol
15.05 X 1023 = MOLES X 6.02 X 1023
1.51 X 1024 PARTICLES H2SO4
2.5 MOL
3 S.F.
3 S.F.

2. ex#1--CALCULATE THE NUMBER OF PARTICLES IN 100.0 GRAMS OF NaOH.
FACTOR LABEL METHOD ( )
100. g 1 ( )
40. g
1 mol ( )
1 mol
6.02 x 1023
particles
1.51 X 1024 PARTICLES H2SO4 = X X

3. FACTOR LABEL, MOLE CALCULATIONS
EX#1—2 CALCULATE THE NUMBER OF LITERS IN 80.0 GRAMS OF CH4(G) AT STP.
EQUATION METHOD:
MOLES = MASS
GFM
GAS VOLUME(STP) = MOLES X L
MOLES = g
16.0g/mol
112. L = MOLES X L
5.00 MOL
3 S.F.
3 S.F.

4. EX#1—2 CALCULATE THE NUMBER OF LITERS IN 80.0 GRAMS OF CH4(G) AT STP.
FACTOR LABEL METHOD ( )
80.0 g 1 ( )
16 g
1 mol ( )
1 mol
22.4 L
STP GAS
112.5 L CH4 = X X

5. FACTOR LABEL, MOLE CALCULATIONS
ex#3--CALCULATE THE MOLARITY CONCENTRATION OF IN GRAMS OF NaOH(SOLUTE) IN. 2 LITERS OF WATER(SOLVENT).
EQUATION METHOD:
MOLES = MASS
GFW
MOLARITY = MOLES
LITERS(solution)
2.5 MOL
= MOLES
2 LITERS
MOLES = g
40.0 g/mol
3 S.F.
3 S.F.

6. ex#3--CALCULATE THE MOLARITY CONCENTRATION OF 100
ex#3--CALCULATE THE MOLARITY CONCENTRATION OF GRAMS OF NaOH(aq) (SOLUTE) IN. 2 LITERS OF WATER(SOLVENT).
FACTOR LABEL METHOD ( )
100 g 1 ( )
40 g
1 mol 1 ( )
2 L
1.25 mol/L NaOH = X X