General ChemistrySeptember 5, 2003

1
General Chemistry September 5, 2003 Dr.
J. Group HO or H2O NAMES ______________
______________ ______________ ______________
It can be shown experimentally that two volumes
of hydrogen gas and one volume of oxygen gas
react to form two volumes of water in the gas
state (assuming all gases are at the same
temperature and pressure). This is shown
schematically in the boxes below
Several chemical equations could be used to
explain this observation. They are shown below.
For each possible reaction, state if the equation
obeys or violates the Law of Mass Conservation
and the Law of Combining Volumes.
Mass Conservation Combining Volumes

Obeys
Violates. Predicts 1VH 1VO give 1VHO not
212 as above

1 part. 1 part. gives 1
part. 1 vol. 1 vol. gives
1 vol. PREDICTION IF TRUE
Using the previous data from Hydrogen Chlorine
gives hydrogen chloride, what is the 1.
Chemical formula for water. ______ 2.
Relative Mass of O (Hydrogen 1) _______