Gaseous hydrogen (dark molecules) and oxygen (light molecules) react in a closed

Question

Gaseous hydrogen (dark molecules) and oxygen (light molecules) react in a closed flask to produce gaseous water as shown below. a) Write a balanced chemical equation for this process. b) If the total pressure before the reaction occurs (left image) is 3 atm, what is the partial pressure of hydrogen in the flask before the molecules react. c) Based on the images, which species is the limiting reactant- water. oxygen, hydrogen, or none of these? Justin your answer, d) As the reaction proceed is the total pressure inside the flask increasing. decreasing or staying the same? Justify your answer.

Explanation / Answer

a) 7H2+10O2 ---------> 5H2O + 2H2( UNREACTED)

B) 7H2+10O2 EXERT 3 atm. So H2 will exert (7/17)*3= 1.235 atm

c) After the reaction some Hydrogen remains unreacted so O2 is limiting.

d) Initially there were more number of molecules exerting pressure on each other, now the number of molecules reduce and pressure also reduces

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