Sunday, January 30, 2011

LESSON 22

MASS TO MASS CONVERSIONS
  • Mass to mass problems involve one addition conversion
  • (WHAT YOU NEED OVER WHAT YOU HAVE)
  Grams of A                                    Grams of B
         |                                                    |
        to                                                   to
         |             (chemical equation)         |
   Moles of A  ----------------------->  Moles of B
                 (multiply by stoichiometric)

eg. What mass of potassium chloride is produced when chlorine reacts with 0.47 g of potassium fluoride?
Cl2  +  2KF  -->  2KCl  +  F2
                            0.47g  x  mol  x  2  x  74.6g  =  0.60 g of sodium chloride
                                           58.1g    2       mol


eg. When Polonium (IV) nitrate reacts with 7.5g of Rubidium fluoride. How many grams of polonium (IV) nitrate are required for a complete reaction.
Po(NO3)4  +  4RbF  -->  PoF4  +  4RbNO3
                          7.5g  x  mol  x  1  x  457g  =  8.2 g of polonium (IV) nitrate
                                     104.5g   4      mol

eg. What mass of cesium bromide is produced when bromine reacts with 0.35 g of cesium iodide?
Br2  +  2CsI  -->  2CsBr  +  I2
                         0.35g  x  mol  x  2  x  212.8  =  .29 g of cesium bromide
                                      259.8g    2       mol
         
-sherilyn

posted by chemistry11 @ 9:12 PM

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