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    Stoichiometry

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    api-205419744
    The document discusses stoichiometry, molarity, and dilution. It defines stoichiometry as the relationship between reactants and products in a chemical reaction. Molarity is defined as the number of moles of solute dissolved in a given amount of solution. An equation for molarity and sample problems are provided. Dilution is explained as using an equation where the concentration and volume of an original solution are proportional to the diluted concentration and volume. Sample dilution problems are also presented.

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    Stoichiometry

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    api-205419744
    124 views8 pages
    The document discusses stoichiometry, molarity, and dilution. It defines stoichiometry as the relationship between reactants and products in a chemical reaction. Molarity is defined as the number of moles of solute dissolved in a given amount of solution. An equation for molarity and sample problems are provided. Dilution is explained as using an equation where the concentration and volume of an original solution are proportional to the diluted concentration and volume. Sample dilution problems are also presented.

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    The document discusses stoichiometry, molarity, and dilution. It defines stoichiometry as the relationship between reactants and products in a chemical reaction. Molarity is defined as the number of moles of solute dissolved in a given amount of solution. An equation for molarity and sample problems are provided. Dilution is explained as using an equation where the concentration and volume of an original solution are proportional to the diluted concentration and volume. Sample dilution problems are also presented.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    124 views8 pages

    Stoichiometry

    Uploaded by

    api-205419744
    The document discusses stoichiometry, molarity, and dilution. It defines stoichiometry as the relationship between reactants and products in a chemical reaction. Molarity is defined as the number of moles of solute dissolved in a given amount of solution. An equation for molarity and sample problems are provided. Dilution is explained as using an equation where the concentration and volume of an original solution are proportional to the diluted concentration and volume. Sample dilution problems are also presented.

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    © All Rights Reserved
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    Download as pdf or txt
    of 8

    Stoichiometry and Molarity- SE 5 18/12/2017

    STOICHIOMETRY

    Copy Me!

    RECAP: BALANCING CHEMICAL EQUATIONS

    Recap Counting Atoms


    Subscript: Tells you the number of atoms
    Coefficient: Tells you the number of molecules
    Parentheses: Groups atoms together

    A. Di Lallo CRHS 2017 1


    Stoichiometry and Molarity- SE 5 18/12/2017

    22 5()3

    Subscript
    Coefficient Subscript Coefficient

    Parentheses

    Copy Me!

    RECAP: BALANCING CHEMICAL EQUATIONS

    When balancing a chemical equation


    DO NOT split formula
    DO NOT change formula
    DO NOT change subscripts
    CAN ONLY change the coefficients

    A. Di Lallo CRHS 2017 2


    Stoichiometry and Molarity- SE 5 18/12/2017

    Copy Me!

    STOICHIOMETRY

    Def: relationship between reactants and products


    The coefficients in the chemical reaction = moles of molecules in the chemical
    reaction
    From that, one can predict moles produced, and mass produced

    Copy Me!

    2 () + 2() 2 2()

    N O + O O O
    N
    O

    N O N
    O O

    A. Di Lallo CRHS 2017 3


    Stoichiometry and Molarity- SE 5 18/12/2017

    Copy Me!

    2() + 2 22()

    Mol Ratio 2 1 2
    Molecules 1.204 x 1024 6.022 x 1023 1.204 x 1024

    Copy Me!

    2() + 2 22()

    Mol Ratio 2 1 2
    Molecules 1.204 x 1024 6.022 x 1023 1.204 x 1024
    Molar Mass 30.01 g/mol 32.0 g/mol 46.01 g/mol

    Mass reacting 15 g 8g 23 g
    Mol Reacting 0.5 mol 0.25 mol 0.5 mol

    A. Di Lallo CRHS 2017 4


    Stoichiometry and Molarity- SE 5 18/12/2017

    Copy Me!

    2 5 () + 2 22() + 32 ()

    Mol Ratio 1 1 2 3
    Molar Mass 46.08 g/mol 32.0 g/mol 44.01 g/mol 18.02 g/mol

    Mass reacting 15 g 10.4 g 28.6 g 17.57 g


    Mol Reacting 0.325 mol 0.325 mol 0.65 mol 0.975 mol

    Copy Me!

    REMEMBER

    Calculating moles from molecules Calculating moles from mass:


    #
    = =

    Calculating molecules from moles Calculating mass from moles:


    = =

    n = moles NA = Avogadros number m = mass MM = molar mass

    A. Di Lallo CRHS 2017 5


    Stoichiometry and Molarity- SE 5 18/12/2017

    Copy Me!

    MOLAR CONCENTRATION (MOLARITY)

    Molar concentration (molarity) of a solution is the number of moles of solute


    dissolved in a given amount of solution


    Equation =

    C: Molarity (molar concentration) mol/L
    n: number of moles of solute (mol)
    V: volume of solution (L)

    A. Di Lallo CRHS 2017 6


    Stoichiometry and Molarity- SE 5 18/12/2017

    1. What is the molar concentration of 1.5 moles of NaCl dissolved in 200 mL of


    solution?

    2. How many moles of HCl are found in 25 mL sample of a 10 M concentration?

    3. You have 3 moles of caffeine. What is the volume of the solution needed to make a
    0.15 mol/L solution?

    Copy Me!

    DILUTION

    Equation used to calculate an unknown quantity where two solutions are proportional
    to each other
    1 1 = 2 2
    Before dilution 1 1
    C1 :Original concentration (mol/L),
    V1 :Original volume (L)

    After dilution 2 2
    C2 : Diluted concentration(mol/L),
    V2 : Dilution volume (L)

    A. Di Lallo CRHS 2017 7


    Stoichiometry and Molarity- SE 5 18/12/2017

    1. You have 100 mL of a 2.5 M KBr solution. You need a final concentration of 0.55 M.
    Whats the volume of the final solution?

    2. A stock solution of 1 M NaCl is available. How many mL of this stock solution is


    needed to make 100 mL of 0.75M

    3. Concentration H2SO4 is 18 M. What volume is needed to make 2L of 1 M solution?

    A. Di Lallo CRHS 2017 8

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