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 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 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 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.