FACTOR LABEL, MOLE CALCULATIONS

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Presentation transcript:

FACTOR LABEL, MOLE CALCULATIONS ex#1--CALCULATE THE NUMBER OF PARTICLES IN 100.0 GRAMS OF NaOH. 4 S.F. EQUATION METHOD: MOLES = MASS GFM PARTICLES = MOLES X 6.02 X 1023 MOLES = 100.0 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.

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

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 22.4 L MOLES = 80.0 g 16.0g/mol 112. L = MOLES X 22.4 L 5.00 MOL 3 S.F. 3 S.F.

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

FACTOR LABEL, MOLE CALCULATIONS ex#3--CALCULATE THE MOLARITY CONCENTRATION OF IN 100.0 GRAMS OF NaOH(SOLUTE) IN. 2 LITERS OF WATER(SOLVENT). EQUATION METHOD: MOLES = MASS GFW MOLARITY = MOLES LITERS(solution) 2.5 MOL 1.25 = MOLES 2 LITERS MOLES = 100.0 g 40.0 g/mol 3 S.F. 3 S.F.

ex#3--CALCULATE THE MOLARITY CONCENTRATION OF 100 ex#3--CALCULATE THE MOLARITY CONCENTRATION OF 100.0 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