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    Molmasskeybq

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    Joven Martinez

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    Molmasskeybq

    Uploaded by

    Joven Martinez
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    molmasskeybq (1)

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    5 views3 pages

    Molmasskeybq

    Uploaded by

    Joven Martinez

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    © All Rights Reserved
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    of 3

    Stoichiometry Worksheet #2 (mole-mass, mass-mole problems)

    1. N2 + 2O2 → N2O4
    a. If 15.0g of N2O4 was produced, how many moles of O2 were required?

    15.0g N2O4 1 mol N2O4 2 mol O2 = 0.326 mol O2


    92.0g N2O4 1 mol N2O4

    b. If 4.0x10-3 moles of oxygen reacted, how many grams of N2 were needed?

    4.0x10-3 mol O2 1 mol N2 28.0g N2 = 5.6x10-2 g N2


    2 mol O2 1 mol N2

    2. K3PO4 + Al(NO3)3 → 3KNO3 + AlPO4


    a. What is the mass of potassium nitrate that is produced when 2.04 moles of potassium
    phosphate react?

    2.04 mol K3PO4 3 mol KNO3 101.1 g KNO3 = 619g KNO3


    1 mol K3PO4 1 mol KNO3

    b. If 5.80g of aluminum phosphate are formed, how many moles of aluminum nitrate
    reacted?

    5.80g AlPO4 1 mol AlPO4 1 mol Al(NO3)3 = 4.75x10-2 mol Al(NO3)3


    122.0g AlPO4 1 mol AlPO4

    3. CaC2 + 2H2O → Ca(OH)2 + C2H2


    a. If you have 5.50 mol of CaC2, how much C2H2 do you get?

    5.50 mol CaC2 1 mol C2H2 26.0g C2H2 = 143g C2H2


    1 mol CaC2 1 mol C2H2

    b. How many moles of water are needed when 65.0g of CaC2 have reacted?

    65.0g CaC2 1 mol CaC2 2 mol H2O = 2.03 mol H2O


    64.1g CaC2 1 mol CaC2
    4. In photosynthesis, water reacts with carbon dioxide to give oxygen and glucose (C6H12O6). Write
    and balance the chemical equation. How many moles of CO2 are required to make 120.0g of
    glucose?

    6H2O + 6CO2 → C6H12O6 + 6O2

    120.0g C6H12O6 1 mol C6H12O6 6 mol CO2 = 4.000 mol CO2


    180.0 g C6H12O6 1 mol C6H12O6
    5. 2NaClO3→ 2NaCl + 3O2 Balance and answer the following questions.
    a. How many grams of NaCl are produced when 20.00mol of NaClO3 react?

    20.00 mol NaClO3 2 mol NaCl 58.5g NaCl = 1170g NaCl


    2 mol NaClO3 1 mol NaCl

    b. How many moles of O2 are produced when 40g of NaCl are formed?

    40 g NaCl 1 mol NaCl 3 mol O2 = 1 mol O2


    58.5g NaCl 2 mol NaCl

    6. 8Fe + S8 → 8FeS
    How many moles of FeS are produced when 0.93g of S8 react?

    0.93g S8 1 mol S8 8 mol FeS = 2.9x10-2 mol FeS


    256.8 g S8 1 mol S8

    7. Write a balanced chemical equation to represent the combustion of decane (C10H22). How many
    moles of water will form with the combustion of 540.4g of decane?

    2C10H22 + 21O2 → 20CO2 + 22H2O

    540.4g C10H22 1 mol C10H22 22 mol H2O = 41.86 mol H2O


    142.0g C10H22 2 mol C10H22

    8. Balance and then answer the following questions:


    _4NH3(g) +5O2(g) → 4NO(g) + 6H2O(g)
    a. How many moles of NO are formed if 824g of NH3 react?

    824g NH3 1 mol NH3 4 mol NO = 48.5 mol NO


    17.0g NH3 4 mol NH3

    b. How many grams of water are formed if 2.55 mol of ammonia are oxidized?

    2.55 mol NH3 6 mol H2O 18.0 g H2O = 68.9g H2O


    4 mol NH3 1 mol H2O

    9. Mercury (II) oxide decomposes into mercury and oxygen gas.


    a. Write and balance the equation.

    2HgO → 2Hg + O2

    b. How many moles of mercury (II) oxide are needed to produce 125g of oxygen?

    125g O2 1 mol O2 2 mol HgO = 7.81 mol HgO


    32.0 g O2 1 mol O2
    c. How many grams of mercury are produced if 24.5 moles of mercury (II) oxide
    decomposes?

    24.5 mol HgO 2 mol Hg 200.6g Hg = 4.91x103 g Hg


    2 mol HgO 1 mol Hg

    10. Cu + 2AgNO3 → Cu(NO3)2 + 2Ag


    How many moles of Cu are needed to react with 3.50g of AgNO3?

    3.50g AgNO3 1 mol AgNO3 1 mol Cu = 1.03x10-2 mol Cu


    169.9g AgNO3 2 mol AgNO3

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