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Mole Calculations: Particles, Liters, and Molarity Examples

Learn how to calculate particles, liters of gas at STP, and molarity concentration in solutions with step-by-step examples using mole calculations.

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Mole Calculations: Particles, Liters, and Molarity Examples

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  1. FACTOR LABEL, MOLE CALCULATIONS MOLES = MASS GFM MOLES = 100.0 g 40.0 g/mol ex#1--CALCULATE THE NUMBER OF PARTICLES IN 100.0 GRAMS OF NaOH. 4 S.F. EQUATION METHOD: PARTICLES = MOLES X 6.02 X 1023 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. ( ) 6.02 x 1023 particles 100. g 1 mol ( ( ) ) 1 40. g 1 mol FACTOR LABEL METHOD 1.51 X 1024 PARTICLES H2SO4 = X X

  3. FACTOR LABEL, MOLE CALCULATIONS MOLES = MASS GFM MOLES = 80.0 g 16.0g/mol EX#1—2 CALCULATE THE NUMBER OF LITERS IN 80.0 GRAMS OF CH4(G) AT STP. EQUATION METHOD: GAS VOLUME(STP) = MOLES X 22.4 L 112. L = MOLES X 22.4 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. ( ) 22.4 L STP GAS 80.0 g 1 mol ( ( ) ) 1 16 g 1 mol FACTOR LABEL METHOD 112.5 L CH4 = X X

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

  6. ex#3--CALCULATE THE MOLARITY CONCENTRATION OF 100.0 GRAMS OF NaOH(aq) (SOLUTE) IN. 2 LITERS OF WATER(SOLVENT). ( ) 100 g 1 mol 1 ( ( ) ) 1 40 g 2 L FACTOR LABEL METHOD 1.25 mol/L NaOH = X X

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