CHEM 1001/CHM 1020/ Chm1025C/CHM1032C         Name:________

Module 5 SamplePretest

Part I  Mole-Mole Stoichiometry       5 points

 

Tungsten occurs in the important mineral sheelite (Calcium tungstate), which is converted to tungstic acid.  Tungsten is then extracted from tungstic acid by the following (unbalanced) reaction:

              

                    H2   +       H2WO4      à        W        +        H2O

 

How moles of hydrogen is needed to prepare 6 moles of elemental tungsten?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Phosphoric acid can be made by the following (unbalanced) reaction:

 

                     H2O          +          P4O10     à              H3PO4

 

How many moles of Phosphoric acid can be prepared from the combination of 5 moles of Tetraphosphorus decoxide with excess water?       

 

 

 

 

 

 

 

 

 

 

 

 

 

CHEM 1001/CHM 1020/ Chm1025C/CHM1032C   Name:_______________

Module 5 SamplePretest

Module Five-Part J   Mass-Mass Stoichiometry    5 points

 

Toluene and nitric acid are used in the production of trinitrotoluene (TNT), an explosive:

 

C7H8      +   HNO3       à      C7H5N3O6      +     H2O      (Unbalanced)

 

Calculate the mass of TNT that can be made from 192 g of C7H8 (toluene).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

What mass of carbon dioxide is produced from the combustion of 176 grams of propane gas ,  C3H8 , in excess oxygen gas,  O2.  Water is the only other product.