CW/HW – Stoichiometry Take 2 Conversions of Amounts in Moles to Mass (pg 306): Name:_______________________________ Date:_______________________________ Period:_______________________________ 1) ___KClO3 (s) ___ KCl (s) + ___ O2 (g) Oxygen gas can be produced by decomposing potassium chlorate using the reaction
above . If 1.06 moles of KClO3 is heated and decomposes completely, what mass of
oxygen gas is produced?
2) ____F2 (g) + ___ NH3 (g) ____ N2F4 (g) + ____ HF (g) If 7.18 moles of fluorine gas is used in this reaction, how many grams of hydrogen
fluoride are produced?
3) Using the balanced equation from question 2, how many grams of dinitrogen tetrafluoride
are produced if 2.30 moles of ammonia are used?
4) ____Al (s) + ____ CuSO4 (aq) ____ Al2(SO4)3 (aq) + ____ Cu (s) How many grams of copper are produced in the above reaction if 0.237 moles of copper
sulfate are used?
5) Using the above reaction, how many grams of aluminum were used if 0.1 moles of
aluminum sulfate were produced?
Conversions of Mass to Amounts in Moles (pg 308)
6) ____NaClO3 (s) ____ NaCl (s) + ____O2 (g) How many moles of oxygen are produced if 100.5 grams of sodium chlorate are used? CW/HW – Stoichiometry Take 2 7)
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Using the balanced equation from question 6, how many moles of sodium chloride are produced if 100.5 grams of sodium chlorate are used? ___LiOH + ___KCl ___LiCl + ____KOH How many moles of potassium hydroxide are produced in the reaction above if you used 8.12 grams of lithium hydroxide? ____NaCl (aq) + ___CaO(aq) ____CaCl2 + ____Na2O How many moles of sodium oxide are produced if 14 grams of sodium chloride were used? Using the balanced chemical reaction from question 9, how many moles of calcium chloride are produced if 14 grams of sodium chloride are used? Mass to Mass Conversions (pg 310) 11) ____Be (s) + ____HCl (aq) ____BeCl2 (aq) + ____H2(g) How many grams of hydrogen gas are produced and released into the environment if 5.8 grams of hydrochloric acid (HCl) were used in the reaction above? 12) ____FeBr2 + ____ KCl ____ FeCl2 + ____KBr How many grams of Iron (II) chloride are produced in the above reaction if 2.4 grams of potassium chloride are used? 13) Using the balanced equation from question 12, how many grams of potassium bromide are produced if 7.02 grams of Iron (II) bromide are used? CW/HW – Stoichiometry Take 2 14) ____C3H8 (g) + ____ O2 (g) ___CO2 + ____H2O In the above reaction, if 3.5 grams of oxygen are used, how many grams of water are produced? 15) Using the balanced equation from question 14, how many grams of carbon dioxide are produced if 5 grams of tricarbon octahydride are used? Mixed Review: Directions: Write the chemical equation and balance before beginning these problems. (DON’T FORGET ABOUT DIATOMIC ELEMENTS ☺ ) 16) Lithium hydroxide reacts with hydrobromic acid (HBr) to produce lithium bromide and water. If you start with 10 grams of lithium hydroxide, how many grams of lithium bromide will be produced? 17) Carbon monoxide reacts with oxygen gas to produce carbon dioxide. How many moles of carbon dioxide can be formed if 0.5 moles of oxygen gas are used? 18) Hydrogen gas reacts with oxygen gas to produce water. How many grams of water are produced if 7 moles of hydrogen gas are used? 19) Hydrogen gas reacts with nitrogen gas to produce ammonia (or nitrogen trihydride). How many moles of ammonia are produced if 0.3 grams of nitrogen gas are used? 20) Calcium reacts with oxygen gas to produce calcium oxide. How many grams of calcium oxide are produced if 7.3 grams of calcium are used? CW/HW – Stoichiometry Take 2 Answers: My calculations were performed without rounding the atomic masses. If you get a number close to these, chances are you took the correct steps but rounded your formula weights. 1)
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50.88 g of O2 172.37 g of HF 119.61 g of N2F4 15.06 g of Cu 5.396 g of Al 1.416 mol of O2 0.944 mol of NaCl 0.339 mol of KOH 0.12 mol Na2O 0.12 mol Na2O 0.16 g of H2 2.04 g of FeCl2 7.75 g of KBr 1.576 g of H2O 14.981 g of CO2 36.264 g of LiBr 1 mol CO2 126.1036 g of H2O 0.0214 mol of NH3 10.21 g of CaO