Stoichiometry Practice Test

 

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  1. The formation of NH3 from N2 and H2 occurs in 85.0% yield.  How many grams of ammonia would be experimentally obtained when 12 g of H2 reacts with 20g of N2?

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  2. An iron ore sample contains Fe2O3 plus other impurities. A 752 – g sample of impure iron ore is heated with excess carbon, producing 453 g of pure iron by the following reaction:

    Fe2O3 (s) + 3C(s)    → 2Fe(s) + 3CO(g)

    What is the mass percent of Fe2O3 in the impure iron ore sample?

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  3. An ionic compound MX3 is prepared according to the following unbalanced chemical equation:

    M + X2    → MX3

    A 0.105 – g sample of X2 contains 8.92 x 1020 molecules.  The compound MX3 consists of 54.47% X by mass.  What are the identities of M and X, and what is the correct name for MX3?

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  4. A 0.4230 – g sample of impure sodium nitrate was heated, converting all the sodium nitrate to 0.2864 g of sodium nitrite and oxygen gas.  Determine the percent of sodium nitrate in the original sample.

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  5. A compound contains only carbon, hydrogen, and oxygen.  Combustion of 10.68g of the compound yields 16.01 g CO2 and 4.37 g H2O.  If 0.356 moles of this compound has a mass of 62.69 g, what is the molecular formula of this compound?

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  6. Iron is produced by the following reaction:

    2C(s) + O2 (g)    → 2CO (g)
    Fe2O3 (s) + 3CO (g)    → 2Fe (s) + 3 CO2 (g)

    How many moles of O2 (g) are needed to produce 3 moles Fe(s) assuming the reaction goes to completion?

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  7. Ammonia gas reacts with copper (II) oxide to produce nitrogen gas, copper metal and water.  What is the stoichiometric coefficient in front of the copper (II) oxide when the equation for this reaction is correctly balanced?

     

     

  8. For the following reaction:

    2 NH3 + 3 O2 + 2 CH4    → 2 HCN + 6 H2O

    How many grams of HCN will form when 800. g NH3, 1200. g O2 and 600. g CH4 are mixed?  Assume the reaction goes to completion.

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  9. When ammonia reacts with oxygen it yields nitrogen monoxide and water.  What is the value of the coefficient in front of the water?

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