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7.6.2: Practice Stoichiometry part 2

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    236045

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    Exercise \(\PageIndex{1}\)

    2 Mg (s) + O2 (g) \(\rightarrow\) 2 MgO (s)

    In the reaction above, how many grams of MgO would be produced from 6.87 g of Mg and 5.22 g O2?

    Answer

    11.4 g MgO (Mg is limiting)

    Exercise \(\PageIndex{1}\)

    2 NH3 (g) + 3 O2 (g) \(\rightarrow\) 3 H2O (g) + N2O3 (g)

    In the reaction above, how many grams of N2O3 would be produced from 12.76 g of NH3 and 17.44 g O2?

    Answer

    13.81 g N2O3  (O2 is limiting)

    In the reaction above, how many grams of N2O3 would be produced from 0.765 moles NH3 and 1.206 moles O2?

    Answer

    29.1 g  (NH3 is limiting)

    Exercise \(\PageIndex{1}\)

    2 HgO (s) \(\rightarrow\) 2 Hg (l) + O2 (g)

    If you heat 375.0 grams of HgO and obtain 248.4 g Hg, what is your percent yield?

    Answer

    71.52 %  (expect 347.3 g Hg product)

    Exercise \(\PageIndex{1}\)

    6 Li (s) + N2 (g) \(\rightarrow\) 2 Li3N (s)

    If you heat 38.44 grams of Li (with plenty of nitrogen) and obtain 44.74 g Li3N, what is your percent yield?

    Answer

    69.57 %  (expect 64.31 g Li3N product)

    Exercise \(\PageIndex{1}\)

    Fe2S3 (s) + 6 HCl (g) \(\rightarrow\)  2 FeCl3 (s) + 3 H2S (g)

    If you treat 17.82 grams of Fe2S3 (with plenty of HCl) and obtain 21.36 g FeCl3, what is your percent yield?

    Answer

    76.83 %  (expect 27.80 g FeCl3 product)

     

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